Design a multi-theater ticket booking system where users search movies/showtimes, hold specific seats from a shared seat map, and confirm the hold before it expires, with correctness under concurrent booking attempts.
Design a movie ticket booking system: users search movies and browse theaters/showtimes, pick specific seats from a shared seat map for a showtime, and book one or more seats in a single reservation. Booking has two steps: the user holds the chosen seats, then confirms the hold; a hold not confirmed within 10 minutes expires and frees its seats. If two users attempt to hold the same seat at the same time, exactly one must succeed. Users can also cancel a reservation.
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