Adding Another Guest to Your Celebrity Cruises Booking - 1 8oo--837~44~6o or 1 8oo--4o6~84~95 Travel plans sometimes change after a cruise has been reserved. If a family member, friend, or travel companion decides to join your vacation, you may be able to request that another passenger be added to your Celebrity Cruises reservation. Whether this is possible depends on your cabin occupancy, availability, and the terms of your booking. If you're planning to book a cruise or need Cruise Helpdesk Booking Support, reviewing your reservation details before requesting any changes can help make the process easier.