Confermo is a WhatsApp assistant for medical practices and clinics in Italy. Patients write to the practice's own WhatsApp number to book, reschedule or cancel appointments, with no app to install. The assistant proposes only slots that are genuinely free, based on each doctor's working hours, visit durations, existing appointments and time off, and it syncs with Google Calendar. Reminders are sent automatically - 24 hours and 1 hour before by default, configurable - with one-tap confirmation; a cancellation in chat frees the slot immediately and it is offered to the next patient on the waiting list. Built on the official WhatsApp Business Platform as a Meta Tech Provider, so each practice sends and receives on its own number. GDPR by design: minimal data, explicit consent, and no clinical documents requested in chat. It is not a practice management system and it does not make clinical decisions.