If the changes were made online, you should have your confirmation number, last name, credit card number, details about the origin cities' destination cities.
If you have booked an airline ticket through a travel agency, you can change it online. To change your reservation, click on the "My Tips" tab on JetBlue's website.
- Go to JetBlue Home
Log in to your JetBlue account.
After entering, click on "My Directions", then choose "Manage Flights".
Choose which flight you want to cancel.
And finally, it is really easy to cancel flights with JetBlue.