AI Booking Assistant Architecture: Frontend, LLM, Calendar and CRM

Building an AI booking assistant requires connecting multiple systems.

System Overview

┌─────────────────┐
│   Chat UI       │ (React/Next.js)
└────────┬────────┘
         │
┌────────▼────────┐
│   Backend API   │ (Node.js)
└────────┬────────┘
         │
    ┌────┴────┐
    │         │
┌───▼───┐ ┌───▼───┐
│  LLM  │ │ Tools │
└───────┘ └───┬───┘
              │
    ┌─────────┼─────────┐
    │         │         │
┌───▼───┐ ┌───▼───┐ ┌───▼───┐
│Calendar│ │  CRM  │ │ Other │
└────────┘ └───────┘ └───────┘

Frontend (Chat UI)

• Message display

• Input handling

• Typing indicators

• Clickable time slots

• Form components

• State management

Backend API

• Session management

• Message routing

• Tool execution

• Authentication

• Rate limiting

• Error handling

LLM Integration

• Prompt engineering

• Tool definitions

• Response parsing

• Context management

• Token optimization

Calendar Integration

• Availability queries

• Appointment creation

• Rescheduling

• Cancellation

• Webhook handling

CRM Integration

• Contact lookup

• Contact creation

• Field updates

• Workflow triggers

• Activity logging

Security Considerations

• API keys server-side only

• Input validation

• Rate limiting

• Authentication

• Audit logging

Bookux

Bookux builds complete AI booking assistant systems with all components properly integrated.

Related: AI Appointment Booking Assistant · How AI Checks Calendar Availability