Give your voice AI agent a real booking system. This n8n workflow lets the agent check free times, book appointments and add callers to a waitlist during a live phone call, using your Google Calendar and Google Sheets.

What it does

- Returns free start times for a date and service

- Books the slot, after checking it again so the same time can't be double-booked

- Adds callers to a waitlist sheet with their preferred time

- Understands natural dates like "tomorrow" or "October 31st"

- Handles opening hours, closed days and services of different lengths

How it works

Your agent calls three webhook tools. The workflow checks Google Calendar, books or refuses the slot, and replies with a plain-English message the agent can read out, so a short prompt is enough.

Tested live with ElevenLabs Agents and Vapi.

What's included

- 1 n8n workflow (JSON file)

- 1 PDF setup guide, 5 pages, with a sample agent prompt

- 4 screenshots (PNG)

What you need

An n8n instance (Cloud, or self-hosted with public HTTPS), a Google account, and a Vapi or ElevenLabs account. You only edit one Config node for your hours, services and calendar.