Ok I think you have the same problem I use to have at carnival. Well sometimes even online you can not get the past guest number, so I just call carnival by phone, is a free number, and ask them for your past guest #, as soon as you have it enter the guest # in their site for online reservation, just an advice since you call them book them by phone you can get better prices that way, believe me I just save like $400 for my next cruise that way…
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