Our daughter graduates from College this term. She informed us this summer that the graduation ceremony would take place after the spring term. Last night she informed us she was wrong and the ceremony is scheduled to take place while we're in Vegas this December. Naturally this changes our plans. Our Vegas round trip flight was booked over a month ago. My question is.....can we move up the return leg of the trip, and if so, is there a significant charge? I've already looked at booking a retun trip from Vegas on Travelocity, which unfortunately would cost almost as much as the original round trip purchase price. We thought we scored big when we booked the trip....$370 for both of us. Thanks.