flights_db = [
    {"id": "f001", "source": "Chennai", "destination": "Delhi", "date": "2025-04-20", "price": 3500},
    {"id": "f002", "source": "Chennai", "destination": "Mumbai", "date": "2025-04-20", "price": 3000},
]

users_db = [
    {"id": "u123", "name": "Alice"},
    {"id": "u456", "name": "Bob"},
]

bookings_db = []