I am currently booked on the May 23rd Fantasy Western Caribbean and am assuming cancellation will happen any day now. We booked through Costco and I am wanting to reschedule to a March 2021 Western Caribbean. When cancellation happens do I call Costco or DCL to book on the new cruise? What if I go ahead and do a hold on the cruise and cabin that I would like on DCL? How will this work? Just trying to gather info ahead of time. Thanks for you help!