I had online booked myself 3 nights at CP that came up at zero cost. Then I decided to use an offer for a MM slot tournament qualifier, but I had to stay at Bally's, Harrahs, Rio, or The Quad. I called to book the tournament offer and explained that I needed to replace one night at CP with one night at Bally's to use the tournament offer. There was no problem doing this for them. I just couldn't talk them into letting me stay at CP all 3 nights and still play in the tournament.