Restaurant table booking mobile app

We are a small chain of restaurants and we want our own mobile application for reserving tables. When a guest opens the app, they should first see a map of the city with all of our venues marked, so they can pick the one that is closest or most convenient for them. After choosing a restaurant, the guest selects a date, a time and the number of people in their party, and the app must show the real availability of tables for that exact hour. If the desired time is already fully booked, the system should automatically suggest the nearest free slots so that the guest does not give up and leave. Once the reservation is placed, the guest receives an instant confirmation that includes the venue name, address, time and table number. A few hours before the visit the app sends a friendly reminder and lets the guest change or cancel the booking with a single tap. We also need a separate panel for the floor manager that shows the schedule for the day, the load by hour and notes for each table, such as a window seat or a birthday. The app must run on both iOS and Android, allow login by phone number and keep a history of each guest. The design should be clean and bright with real photos of the interior. We welcome proposals from experienced teams with a portfolio of finished apps.