All Projects
PROJECT / 10

AI VOICE AUTOMATION

AI Voice Receptionist & Appointment Booking

An n8n tool set behind a Vapi AI voice agent that answers calls, reads real calendar availability, and books appointments straight into Google Calendar.

Built in n8n

THE CHALLENGE

A process worth improving.

Calls and booking requests arrive when nobody can answer—callers wait, appointments get penciled in wrong, and every booking has to be typed into the calendar by hand.

THE SOLUTION

A structured automation architecture.

A voice agent is backed by two n8n tools: GetSlots checks real Google Calendar availability and returns cleanly formatted open times, while BookSlots validates the request, converts the time to the caller's timezone, creates the calendar event, confirms the booking to the caller, and logs it to Airtable—with friendly spoken error responses whenever a step fails.

WORKFLOW

From trigger to reliable output.

Each stage has a defined responsibility, making the system easier to test, maintain, and improve.

01
Caller speaks

The AI receptionist takes the call and decides which tool to use.

Vapi
02
GetSlots

Receive the requested date and time from the voice agent.

n8n tool
03
Availability check

Read calendar events, sort them, and find open slots.

Google Calendar
04
Available times

Format open slots and answer the caller through the webhook.

Vapi
05
BookSlots

Receive the chosen slot and booking details.

n8n tool
06
Create event

Parse the booking, convert time zones, and create the calendar event.

Google Calendar
07
Confirm booking

Send a success response back to the caller.

Vapi
08
Log booking

Write the confirmed booking details to Airtable.

Airtable
n8n editor showing the AI receptionist workflow with GetSlots and BookSlots tools, Google Calendar, Vapi responses, and Airtable logging
The live workflow in the n8n editor.

AUTOMATION LOGIC

Built as a system, not a shortcut.

The workflow is designed around predictable inputs, clear decisions, reviewable AI output, and recoverable errors.

  1. 01Trigger — receives and validates the initial input
  2. 02Data processing — structures information for downstream steps
  3. 03AI step — generates or classifies within defined constraints
  4. 04Conditions — route each result to the correct path
  5. 05API calls — exchange data with connected applications
  6. 06Output — delivers or stores a usable result
  7. 07Error handling — records failures and supports recovery

TOOLS

n8nVapiAI Voice AgentGoogle CalendarAirtable

DESIGNED OUTCOME

The system is designed to answer calls at any hour, quote real availability, book appointments directly into the calendar, and keep a record of every booking without manual entry.

WHAT I LEARNED

A voice agent is only as good as the tools behind it—clean slot formatting and clear error responses are what keep spoken conversations natural.

NEXT STEP

Have a workflow like this?

Let’s Work Together