Seems like miscommunication and the agent is trying to change (re-book) the entire ticket to include NH flight number in E class. You just want to ask for the UA codeshare # to be changed to the native NH flight number # on the current ticket - that will cause A to go to E by itself.
Last edited by WineCountryUA; Nov 3, 2023 at 11:54 am
Reason: thread cleanup after move, thanks for the link