Not at all an issue to worry about other than which one Hilton system gives you points for. I have had this happen a few times. The amusing one was when I had two concurrent reservations in Manhattan and a close friend and co-worker took my Doubletree Times Square South reservation (She was on the reservation as then second person in the room) and I made a big point of telling her make sure you mention I don’t want points because I am staying elsewhere. FD “Where is she staying?’” “The Conrad”. “Oh, I hear that’s nice. Why aren’t you staying there?” ‘I don’t want to stay in the middle of nowhere when all our work is in Midtown.” “Ah, here is your breakfast voucher and some cookies, feel free to stop by for more.”