American Airlines provides assistance to modify reservations and flights, but passengers must follow specific rules to change their flights with them. The American Airlines Cancellation Policy and fees/charges for flights of American Airlines Reservations are provided on their official website.

https://www.aairtickets.com/po....licy/american-airlin

American Airlines Cancellation Policy - Flight Refund & Status

According to American Airlines' cancellation policy, you will get a full refund if you cancel your flight within 24 hours of booking.