Why would anyone book through Expedia? ANY problem, especially during a holiday period that requires an intervention and/or contact with Expedia may be one of the more frustrating experiences of your travel life. If Expedia is kind enough to show you what choices there are, BOOK DIRECTLY with the carrier/hotel/rental agency involved either online or by phone. Save yourself a world of grief should you need to change or cancel.
Exasperated retired Doc.