Family of 3 who has booked RT SFO to NRT on ANA's PE. Now thinking of cancelling the flights and use the credit to rebook on UA as we want to try upgrading to business. There is no upgrade allowed for our ANA flights. However when I tried to cancel the flights, I got this message.

To Future flight creditPlease use confirmation number XXXXXX to return to this canceled reservation in My Trips and make changes for a future trip. Change fees will apply when you use the future flight credit unless you qualify for a change fee waiver. Begin travel by: Feb 22, 2024.

What do they mean by a change fee waiver? And they did not state how much the change fee will be. I don't want to make any change til I understand what it is about. Does anyone have any idea? Thank you.