When the website and the reservations operator says that there are no vacancies for a particular date, other than checking often prior to the desired date, is there anything else I can do? As a Silver I don't have much clout but it seems to me that 3-4 days before that particular date, Hilton should be willing to relent and release an as yet unsold room. Am I way off base? An unsold room is revenue forever lost, isn't it?