I have cruised twice with Carnival in the past (89 and 93). I have a third cruise booked for later this month. I have no idea what my past guest number is, so I did a search on Carnival's website and the search turned up nothing. I do have a different name now than I had on the two previous cruises. I'm wondering, too, if I should call Carnival to get my past guest number. Especially if it will be benficial with regards to upgrades and past guest parties.