United Airlines provides a Manage Booking service to their passengers that allows passengers to make changes to their reservations online with ease. With United Airlines Manage Booking, passengers can check-in for their flights, select seats, view booking details and personal information, add extra baggage or services, and make changes to their bookings. For any issues during the online booking process, passengers can visit the Airlines pet policy. Additionally, you can call 800-864-8331 or +1-844-902-4930 (OTA Skip-Waiting).