AI Cold Caller - FN Call - Check Availability
Shared 11/19/2025
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{
"id": "JmnniCSwc052gQL5",
"meta": {
"instanceId": "9fb634bb746cbe3fe9f7fa86fdd635510d2f0c24c4ba919fbba1ca6aec3c4e57",
"templateCredsSetupCompleted": true
},
"name": "AI Cold Caller - FN Call - Check Availability",
"tags": [],
"nodes": [
{
"id": "e9953c8a-ab31-4f10-b362-5007a835f387",
"name": "Webhook",
"type": "n8n-nodes-base.webhook",
"position": [
-96,
-144
],
"webhookId": "6b61911a-8f03-4494-86c0-f9e11e67cd69",
"parameters": {
"path": "6b61911a-8f03-4494-86c0-f9e11e67cd69",
"options": {},
"httpMethod": "POST",
"responseMode": "responseNode"
},
"typeVersion": 2.1
},
{
"id": "6974c55c-bbd2-4304-bd36-0fce56748705",
"name": "Structured Output Parser1",
"type": "@n8n/n8n-nodes-langchain.outputParserStructured",
"position": [
704,
96
],
"parameters": {
"schemaType": "manual",
"inputSchema": "{\n \"$schema\": \"https://json-schema.org/draft/2020-12/schema\",\n \"title\": \"Date Range Schema\",\n \"type\": \"object\",\n \"properties\": {\n \"startDate\": {\n \"type\": \"string\",\n \"format\": \"date-time\",\n \"description\": \"The start date in ISO 8601 format\"\n },\n \"endDate\": {\n \"type\": \"string\",\n \"format\": \"date-time\",\n \"description\": \"The end date in ISO 8601 format\"\n }\n },\n \"required\": [\"startDate\", \"endDate\"],\n \"additionalProperties\": false\n}\n"
},
"typeVersion": 1.3
},
{
"id": "0cbc72f9-32fa-4b7f-afc0-e0eca91936b5",
"name": "Create Booking",
"type": "n8n-nodes-base.httpRequest",
"onError": "continueErrorOutput",
"position": [
1472,
96
],
"parameters": {
"url": "https://api.cal.com/v2/bookings",
"method": "POST",
"options": {},
"jsonBody": "={{ $json.payload }}",
"sendBody": true,
"sendHeaders": true,
"specifyBody": "json",
"headerParameters": {
"parameters": [
{
"name": "cal-api-version",
"value": "=2024-08-13"
}
]
}
},
"typeVersion": 4.2
},
{
"id": "24fb4bb0-19cb-4dfc-9806-f47b50298ad6",
"name": "Get Booking",
"type": "n8n-nodes-base.httpRequest",
"position": [
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],
"parameters": {
"url": "https://api.cal.com/v2/bookings",
"options": {},
"sendQuery": true,
"sendHeaders": true,
"authentication": "genericCredentialType",
"genericAuthType": "httpHeaderAuth",
"queryParameters": {
"parameters": [
{
"name": "startTime",
"value": "={{ $json.startDate }}"
},
{
"name": "endTime",
"value": "={{ $json.endDate }}"
},
{
"name": "status",
"value": "upcoming"
},
{
"name": "limit",
"value": "=1"
},
{
"name": "eventTypeId",
"value": "={{ $('Set Vars').item.json.cal_call_id }}"
}
]
},
"headerParameters": {
"parameters": [
{
"name": "cal-api-version",
"value": "=2024-08-13"
}
]
}
},
"credentials": {
"httpBearerAuth": {
"id": "DvbTOgvkcULlmmzE",
"name": "Vapi Auth Bearer account"
},
"httpHeaderAuth": {
"id": "tlMMaHIx7zqf0LCc",
"name": "Cal Header Auth"
}
},
"typeVersion": 4.2
},
{
"id": "266e3f45-da06-4c7a-8376-0ae53469d322",
"name": "OpenRouter Chat Model",
"type": "@n8n/n8n-nodes-langchain.lmChatOpenRouter",
"position": [
512,
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],
"parameters": {
"options": {}
},
"credentials": {
"openRouterApi": {
"id": "6z6zYFNsqyqFRUEB",
"name": "OpenRouter account"
}
},
"typeVersion": 1
},
{
"id": "3752391f-a104-41b6-9e41-0f0c067c35b2",
"name": "Set Vars",
"type": "n8n-nodes-base.set",
"position": [
96,
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],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "ad1d9422-de52-4a8c-872f-3750476e9f70",
"name": "date_time",
"type": "string",
"value": "={{ $json.body.message.toolCallList[0].function.arguments.date_time }}"
},
{
"id": "ea19cb2e-1768-4ec5-9868-f0cf44208e32",
"name": "name",
"type": "string",
"value": "={{ $json.body.message.toolCallList[0].function.arguments.name }}"
},
{
"id": "a62e8508-3732-4b12-a443-14edd7b3cc2c",
"name": "email",
"type": "string",
"value": "={{ $json.body.message.toolCallList[0].function.arguments.email }}"
},
{
"id": "4b6cf6e0-8f45-487e-ba6e-05381dd9fc1c",
"name": "cal_call_id",
"type": "number",
"value": {}
},
{
"id": "6cefa32a-2bda-434f-a42e-0aed6fd6abc1",
"name": "cal_call_name",
"type": "string",
"value": ""
},
{
"id": "e82e38dd-b2d1-45e5-a0ad-a7a58a98ce8d",
"name": "cal_call_min_duration",
"type": "number",
"value": {}
},
{
"id": "d1930405-9e13-46c3-91c2-8a5e65d3fd32",
"name": "cal_call_username",
"type": "string",
"value": ""
},
{
"id": "02ba9870-629a-4cc3-ad29-4325f2cf1e2d",
"name": "cal_call_timezone",
"type": "string",
"value": "America/New_York"
},
{
"id": "6a4473e5-fae9-4ffd-aa80-a8b007146914",
"name": "tool_call_Id",
"type": "string",
"value": "={{ $json.body.message.toolCalls[0].id }}"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "cf7a972a-1636-43df-b27a-0a5c5cfad991",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
-112,
-240
],
"parameters": {
"width": 1296,
"height": 528,
"content": "## Set Vars and Booking Timing"
},
"typeVersion": 1
},
{
"id": "27f3e3c1-b7ea-45d5-9f48-aff49cb59497",
"name": "Sticky Note1",
"type": "n8n-nodes-base.stickyNote",
"position": [
1216,
-240
],
"parameters": {
"color": 6,
"width": 704,
"height": 528,
"content": "## Create a booking in cal.com"
},
"typeVersion": 1
},
{
"id": "5b79ceeb-a926-4132-8ea5-2f532a77e642",
"name": "Create Booking Payload",
"type": "n8n-nodes-base.code",
"position": [
1264,
96
],
"parameters": {
"jsCode": "const startDate = $(\"Booking Start and End Time\").first().json.output.startDate;\nconst start = new Date(startDate).toISOString()\n\nconst data = {\n start: start,\n attendee: {\n name: $(\"Set Vars\").first().json.name,\n email: $(\"Set Vars\").first().json.email,\n timeZone: $(\"Set Vars\").first().json.cal_call_timezone,\n language: \"en\"\n },\n eventTypeId: $(\"Set Vars\").first().json.cal_call_id\n};\n\nconst payload = JSON.stringify(data);\n\nreturn {\n json: {\n data,\n payload\n }\n};\n"
},
"typeVersion": 2
},
{
"id": "5fd967ca-811c-4ac5-815e-6b71675a27c6",
"name": "OpenRouter Chat Model2",
"type": "@n8n/n8n-nodes-langchain.lmChatOpenRouter",
"position": [
1232,
672
],
"parameters": {
"options": {}
},
"credentials": {
"openRouterApi": {
"id": "6z6zYFNsqyqFRUEB",
"name": "OpenRouter account"
}
},
"typeVersion": 1
},
{
"id": "7ce3cb8a-e177-4074-8c45-8eecf8629f83",
"name": "Sticky Note2",
"type": "n8n-nodes-base.stickyNote",
"position": [
-112,
320
],
"parameters": {
"color": 5,
"width": 2032,
"height": 528,
"content": "## Check for other booking timings"
},
"typeVersion": 1
},
{
"id": "b33cd0aa-68b3-4bce-8de5-6c5d25464491",
"name": "Booking Start and End Time",
"type": "@n8n/n8n-nodes-langchain.agent",
"position": [
512,
-160
],
"parameters": {
"text": "=You are a date-time calculator.\nGiven an input containing a startDate (ISO 8601 format) and minutesToAdd (integer), calculate the endDate by adding the given minutes to the start date.\n\nReturn only a JSON object — no text, no explanations, no complements.\n\nOutput format (strictly):\n{\n \"startDate\": \"<ISO 8601 string>\",\n \"minutesToAdd\": <integer>,\n \"endDate\": \"<ISO 8601 string>\"\n}\n\nExample:\n\nInput:\n\nstartDate: 2025-10-27T09:30:00Z\nminutesToAdd: 150\n\n\nExpected Output:\n\n{\n \"startDate\": \"2025-10-27T09:30:00Z\",\n \"minutesToAdd\": 150,\n \"endDate\": \"2025-10-27T12:00:00Z\"\n}\n\nHere is the startDate: {{ $json.date_time }}\nadd minutes: {{ $json.cal_call_min_duration }}\n",
"options": {},
"promptType": "define",
"hasOutputParser": true
},
"typeVersion": 2.2
},
{
"id": "f7c0d304-dcfc-4b3b-9d5f-65cd6fd6e631",
"name": "Get Near By Available Slots",
"type": "n8n-nodes-base.code",
"position": [
576,
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],
"parameters": {
"jsCode": "// Safely extract input data\nconst firstInput = $input.first();\n\nconst rawStart = firstInput?.json?.startDate;\nconst rawEnd = firstInput?.json?.endDate;\n\n// Validate that both are valid ISO date strings\nif (!rawStart || !rawEnd) {\n throw new Error(`Missing startDate or endDate. Received startDate=${rawStart}, endDate=${rawEnd}`);\n}\n\n// Parse into JS Date objects\nconst startDate = new Date(rawStart);\nconst endDate = new Date(rawEnd);\n\n// Check if parsing succeeded\nif (isNaN(startDate) || isNaN(endDate)) {\n throw new Error(`Invalid date format. startDate=${rawStart}, endDate=${rawEnd}`);\n}\n\n// ✅ Expand the search range\nstartDate.setHours(startDate.getHours() - 4); // move back 4 hours\nendDate.setDate(endDate.getDate() + 4); // move forward 4 days\n\n// ✅ Format to ISO 8601\nconst expandedStartDate = startDate.toISOString();\nconst expandedEndDate = endDate.toISOString();\n\nreturn {\n json: {\n expandedStartDate,\n expandedEndDate\n }\n};\n"
},
"typeVersion": 2
},
{
"id": "6e75bd02-3568-4599-827e-4e95d2e6bbe2",
"name": "Set Timeslot 1",
"type": "n8n-nodes-base.set",
"position": [
832,
-160
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "e524aaaf-deb3-4b0e-a8c1-9466a5a0c9a4",
"name": "startDate",
"type": "string",
"value": "={{ $json.output.startDate }}"
},
{
"id": "ee4f7d99-21ff-491a-b6bf-36c0b8cf36d3",
"name": "endDate",
"type": "string",
"value": "={{ $json.output.endDate }}"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "cf516d89-6c7c-4e54-85fa-e4d51514f106",
"name": "Get Other Booking Slots",
"type": "n8n-nodes-base.httpRequest",
"position": [
800,
448
],
"parameters": {
"url": "https://api.cal.com/v2/slots",
"options": {},
"sendQuery": true,
"sendHeaders": true,
"authentication": "genericCredentialType",
"genericAuthType": "httpHeaderAuth",
"queryParameters": {
"parameters": [
{
"name": "eventTypeSlug",
"value": "={{ $('Set Vars').item.json.cal_call_name }}"
},
{
"name": "username",
"value": "={{ $('Set Vars').item.json.cal_call_username }}"
},
{
"name": "end",
"value": "={{ $json.expandedEndDate }}"
},
{
"name": "start",
"value": "={{ $json.expandedStartDate }}"
}
]
},
"headerParameters": {
"parameters": [
{
"name": "cal-api-version",
"value": "=2024-09-04"
}
]
}
},
"credentials": {
"httpHeaderAuth": {
"id": "tlMMaHIx7zqf0LCc",
"name": "Cal Header Auth"
}
},
"typeVersion": 4.2
},
{
"id": "498b9b0f-2979-4c95-be08-85f68f41a77f",
"name": "Format Booking Slots",
"type": "@n8n/n8n-nodes-langchain.agent",
"position": [
1232,
448
],
"parameters": {
"text": "=Here are the available booking slots in JSON format:\n{{ $json.data }}\n\nPlease tell the customer in natural language what the next available booking timings are.\n\nToday is {{ $now }}",
"options": {
"systemMessage": "AI Receptionist — Humanized Booking Availability (Optimized Version)\n\nYou are an AI receptionist that helps customers find the next available booking times.\n\nThe input will always be provided in JSON format containing available booking slots (start, end, service, and/or location).\n\nYour task:\n\nParse the JSON input of available time slots.\n\nConsider only the earliest 3–4 future slots, sorted by time.\n\nMerge continuous hourly slots on the same day into a single time range (e.g., “from 9 AM to 5 PM”).\n\nFor non-continuous times on the same day, list them separately (e.g., “at 4 PM and 6 PM”).\n\nFormat output in friendly, conversational language.\n\nPrefer relative days like “tomorrow” or “day after tomorrow”, otherwise use weekday names.\n\nUse 12-hour clock with AM/PM (no 24-hour time).\n\nRespond ONLY with natural language — no JSON, no code.\n\nIf no slots exist:\n→ “I’m sorry, there are no available slots in the next few days. Would you like me to check further ahead?”\n\nExample behavior\nInput:\n\n[\n {\"start\": \"2025-10-28T09:00:00+05:30\"}, \n {\"start\": \"2025-10-28T10:00:00+05:30\"},\n {\"start\": \"2025-10-28T11:00:00+05:30\"},\n {\"start\": \"2025-10-28T17:00:00+05:30\"},\n {\"start\": \"2025-10-29T16:00:00+05:30\"}\n]\n\n\nOutput:\n\n“Tomorrow, we have availability from 9 AM to 11 AM, and also at 5 PM. The day after tomorrow, we can take you at 4 PM.”"
},
"promptType": "define"
},
"typeVersion": 2.2
},
{
"id": "520dd0a3-6b1b-4ea7-93fb-10b72b94d3d5",
"name": "Book if slot is empty",
"type": "n8n-nodes-base.if",
"position": [
1456,
-160
],
"parameters": {
"options": {},
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "11e69321-041e-4db3-b903-e1f2386ab675",
"operator": {
"type": "number",
"operation": "equals"
},
"leftValue": "={{ $json.pagination.totalItems }}",
"rightValue": 0
}
]
}
},
"typeVersion": 2.2
},
{
"id": "6bc71e49-9500-4784-917e-d2651df62f40",
"name": "Merge",
"type": "n8n-nodes-base.merge",
"position": [
352,
448
],
"parameters": {},
"typeVersion": 3.2
},
{
"id": "d7efea65-30e1-4345-84ab-3a5d9483b76c",
"name": "Set Time 1",
"type": "n8n-nodes-base.code",
"position": [
-64,
432
],
"parameters": {
"jsCode": "let startDate = $('Set Timeslot 1').first().json.startDate\nlet endDate = $('Set Timeslot 1').first().json.endDate\n\nreturn {\n json:{\n startDate,\n endDate\n }\n}"
},
"typeVersion": 2
},
{
"id": "5e4bba3a-1987-40ca-ac39-60f9bf3442d2",
"name": "Set Time 2",
"type": "n8n-nodes-base.code",
"position": [
128,
464
],
"parameters": {
"jsCode": "let startDate = new Date().toISOString()\nlet endDate = new Date()\nendDate.setDate(endDate.getDate() + 1);\n\nreturn {\n json:{\n startDate,\n endDate\n }\n}"
},
"typeVersion": 2
},
{
"id": "597a615c-902c-44e3-b26a-88354090d0ad",
"name": "If Time Does Not Exists",
"type": "n8n-nodes-base.if",
"position": [
272,
-144
],
"parameters": {
"options": {},
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "or",
"conditions": [
{
"id": "27e17ee9-8381-4c56-8e04-e1d2bbc4c953",
"operator": {
"type": "string",
"operation": "exists",
"singleValue": true
},
"leftValue": "={{ $json.date_time }}",
"rightValue": ""
}
]
}
},
"typeVersion": 2.2
},
{
"id": "2f6b93d3-2945-4f6e-acef-472f8f3f398a",
"name": "Format Data",
"type": "n8n-nodes-base.code",
"position": [
1024,
448
],
"parameters": {
"jsCode": "let data = $input.first().json.data\ndata = JSON.stringify(data)\n\nreturn {\n json:{\n data\n }\n}"
},
"typeVersion": 2
},
{
"id": "f1b56745-0cfc-492d-91b5-4b7645b28d47",
"name": "Respond Other Slots",
"type": "n8n-nodes-base.respondToWebhook",
"position": [
1584,
448
],
"parameters": {
"options": {},
"respondWith": "json",
"responseBody": "= {\n \"results\": [\n {\n \"toolCallId\": \"{{ $('Set Vars').item.json.tool_call_Id }}\",\n \"result\": \"{{ $json.output }}\"\n }\n ]\n }"
},
"typeVersion": 1.4
},
{
"id": "58a83831-8718-41b9-9e36-a012aa24e75a",
"name": "Respond Confirmation",
"type": "n8n-nodes-base.respondToWebhook",
"position": [
1712,
80
],
"parameters": {
"options": {},
"respondWith": "json",
"responseBody": "= {\n \"results\": [\n {\n \"toolCallId\": \"{{ $('Set Vars').item.json.tool_call_Id }}\",\n \"result\": \"Awesome! You’re all set consultation call. You’ll get a quick confirmation email soon. Thanks for your time — we look forward to speaking with you!\"\n }\n ]\n }"
},
"typeVersion": 1.4
},
{
"id": "345f4f71-f59e-4ee6-88a8-af328d11bf92",
"name": "Sticky Note3",
"type": "n8n-nodes-base.stickyNote",
"position": [
-672,
-240
],
"parameters": {
"width": 528,
"height": 288,
"content": "# 🛠️ Setup Guide\n---\n\n**Author: [Sohail Jafri](https://link.thesohailjafri.me/web_ai) | [Youtube](https://link.thesohailjafri.me/yt_ai) | [Instagram](https://link.thesohailjafri.me/ig_ai) | [Join Skool](https://link.thesohailjafri.me/join-skool)**\n\n## ☕ Buy Me a Coffee\nhttps://link.thesohailjafri.me/buymeacoffee\n\n## Follow these steps to complete your setup"
},
"typeVersion": 1
},
{
"id": "219cc54c-e325-4b9f-a86a-bb50e4d85a2a",
"name": "Sticky Note4",
"type": "n8n-nodes-base.stickyNote",
"position": [
-672,
80
],
"parameters": {
"width": 528,
"height": 848,
"content": "### 1. Webhook Setup\n- Copy your Webhook URL from n8n and paste it into Vapi: \n**Tools → check-cal-booking-availability → server.url**\n\n---\n\n### 2. Connect Required Credentials\n- **OpenRouter API Key** → Interprets & formats booking times \n- **Cal.com Header Auth** → Fetches & creates bookings \n\n---\n\n### 3. Set Vars Node\nEnsure it extracts:\n- `name`\n- `email`\n- `date_time`\n- `tool_call_id`\n- `cal_call_id`\n- `cal_call_username`\n- `cal_call_min_duration`\n\n---\n\n### 4. Booking Logic\nWorkflow handles:\n- Checking if selected slot is free \n- Expanding search range if needed \n- Returning 3–4 best future slots \n- Auto-creating a booking when available \n\n---\n\n### 5. Final Responses\nTwo webhook responses:\n- **Confirmation** → If booking is created \n- **Alternative Slots** → If booking must be rescheduled \n\n"
},
"typeVersion": 1
}
],
"active": true,
"pinData": {
"Webhook": [
{
"json": {
"body": {
"message": {
"call": {
"id": "019a26b1-0500-7558-a82e-9f6031a4e684",
"cost": 0,
"type": "outboundPhoneCall",
"orgId": "fb7ae6bd-eb9c-46a9-9f21-c19e37ee9644",
"status": "queued",
"monitor": {
"listenUrl": "wss://phone-call-websocket.aws-us-west-2-backend-production2.vapi.ai/019a26b1-0500-7558-a82e-9f6031a4e684/listen",
"controlUrl": "https://phone-call-websocket.aws-us-west-2-backend-production2.vapi.ai/019a26b1-0500-7558-a82e-9f6031a4e684/control"
},
"customer": {
"name": "Cakes By Keon",
"number": "+918356946202"
},
"assistant": {
"name": "Emma",
"model": {
"model": "gpt-4o",
"toolIds": [
"91c2dce8-5d0c-427c-8009-238de0aacc23"
],
"messages": [
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{
"node": "Set Time 1",
"type": "main",
"index": 0
}
]
]
},
"Set Timeslot 1": {
"main": [
[
{
"node": "Get Booking",
"type": "main",
"index": 0
}
]
]
},
"Format Booking Slots": {
"main": [
[
{
"node": "Respond Other Slots",
"type": "main",
"index": 0
}
]
]
},
"Book if slot is empty": {
"main": [
[
{
"node": "Create Booking Payload",
"type": "main",
"index": 0
}
],
[
{
"node": "Set Time 1",
"type": "main",
"index": 0
}
]
]
},
"OpenRouter Chat Model": {
"ai_languageModel": [
[
{
"node": "Booking Start and End Time",
"type": "ai_languageModel",
"index": 0
}
]
]
},
"Create Booking Payload": {
"main": [
[
{
"node": "Create Booking",
"type": "main",
"index": 0
}
]
]
},
"OpenRouter Chat Model2": {
"ai_languageModel": [
[
{
"node": "Format Booking Slots",
"type": "ai_languageModel",
"index": 0
}
]
]
},
"Get Other Booking Slots": {
"main": [
[
{
"node": "Format Data",
"type": "main",
"index": 0
}
]
]
},
"If Time Does Not Exists": {
"main": [
[
{
"node": "Booking Start and End Time",
"type": "main",
"index": 0
}
],
[
{
"node": "Set Time 2",
"type": "main",
"index": 0
}
]
]
},
"Structured Output Parser1": {
"ai_outputParser": [
[
{
"node": "Booking Start and End Time",
"type": "ai_outputParser",
"index": 0
}
]
]
},
"Booking Start and End Time": {
"main": [
[
{
"node": "Set Timeslot 1",
"type": "main",
"index": 0
}
]
]
},
"Get Near By Available Slots": {
"main": [
[
{
"node": "Get Other Booking Slots",
"type": "main",
"index": 0
}
]
]
}
}
}