I've seen better customer service in organized criminal conspiracies. We had to cancel a trip because of a family emergency and later tried to rebook. If you're in this position be prepared for hours on hold and a truly masterful runaround. And, finally, they say, "There's nothing we can do." Except, of course, keep your $617.60. Never, never, never again. How Kayak.com stays in business is one of the great mysteries.