Hi - recently I made a mistake in booking dates at a Marriott. I booked through expedia. I need to change the dates from one week to the next but no one can help me do this. Marriott says talk to Expedia. Expedia says talk to Marriott. Finally I got a rep at Expedia who thought the request simple and reasonable but she phoned the hotel and they said they couldn't do it. I know that it is non refundable if cancelled but that is not what I want to do. I just want to change the dates. Isee nothing in any rules and regs that forbid me from ding that. Can anyone help?