How Do I Add Passengers to My Holland America Cruise - 1 8oo--837~44~6o or 1 8oo--4o6~84~95 Travel plans can change after you've booked your cruise. If a family member, friend, or travel companion would like to join your vacation, you may be able to add another passenger to your Holland America Line reservation. Whether an additional guest can be added depends on cabin occupancy, sailing availability, and the terms of your booking.