Descriptions:
Zubair Trabzada builds a production-ready voice AI appointment booking system from scratch, combining three tools into a complete stack: Google AntiGravity generates the client-facing frontend website from a natural language prompt; n8n handles backend automation via webhook triggers and HTTP request nodes; and Retell AI powers the outbound voice agent that calls leads within seconds of form submission.
The live demo shows the full loop in action — a user submits a massage booking form, the n8n webhook fires, and the Retell AI voice agent calls back, checks live Google Calendar availability, negotiates an available time slot, and confirms the booking including a calendar invite. The build walkthrough covers constructing the AntiGravity frontend with a detailed prompt specifying business hours and branding, wiring the n8n webhook to receive the form payload, configuring the HTTP request node to hit the Retell AI API with the caller’s name, phone, email, and service type, and integrating Google Calendar for real-time slot checking. All prompts, n8n workflow JSON, and Retell AI agent configuration are provided free via a linked Google Doc.
The system is positioned as a turnkey product for AI freelancers to sell to local service businesses — massage therapists, auto shops, electricians — that lose revenue to missed inbound calls. It represents a more technically complete implementation than many comparable tutorials, with calendar integration and live availability negotiation setting it apart.
📺 Source: Zubair Trabzada | AI Workshop · Published January 24, 2026
🏷️ Format: Hands On Build
