AI Reservation Assistant for Restaurant

I'm seeking to develop an AI reservation assistant for my family-run restaurant and inn in Valais, Switzerland. The assistant should handle incoming calls and WhatsApp Business chats.

Key features include:
- Take new reservations, check availability, confirm instantly
- Modify or cancel existing reservations
- Sync all bookings in real time with Lightspeed (K Series)
- Support French and English
- Escalate to human staff if needed
- Notify staff of new reservations

Integration requirements:
- Lightspeed reservation system
- Our phone line (IVR)
- WhatsApp Business API
- GDPR-compliant

Please include in your proposal:
- Suggested platform or tech stack
- Timeline
- Price
- Support options