I haven't run into that yet, but I'd find it frustrating too. If I did run into that, I'd be getting with my PCC, since she could probably get me an assigned cabin. If I didn't have a PCC or TA, then I would do the thing that none of us want to do - call in to book. Failing all of that, I simply wouldn't book a cruise. I've grown very picky about where I want to put us.