Could someone clarify whether the person who got the 2 free nights has to be at check-in. I am letting my wife use my 2 free nights along with hers so she can take the kids on a 4 night vacation but I wont be able to go along. She called the Hyatt Diamond line and they told her that the nights are non-transferable and that I would have to be at check-in. Will the hotel give her a problem over this?