I understand that for same departure, different return requires different PNR. So I will make two reservations for me and my wife by taking advantage of reduced mileage award promotion using miles from my account. The question is, if she can not make it, can I cancel her reservation, get the fee waived and get the miles back to my account?

I know if it is the same PNR, it works. But not sure for two different PNRs.

Thanks a lot!