Passengers should first determine whether their reservations are changeable by consulting the United Airlines Flight Change Policy
before making any changes to their flight plans.
Make sure the initial reservation is confirmed before making any adjustments to the flight so that you can do so.
Next, you will be able to cancel the reservations for free if you do so within 24 hours of making them.
Keep in mind that you may only make changes to reservations of any kind once; multiple modifications are not permitted. Therefore, be careful when making any changes to the reservations.
Although you are not permitted to change the passenger's name, you are permitted to repair a spelling error.
If you do not have a non-refundable booking, there is no justification for making changes to your flight reservations.
Read More:- Delta Airlines Flight Change Policy