I have had a terrible, terrible time with Travelocity and changing reservations. You will get f*cked really good because in order to change anything on your reservation after you have booked they will charge the FULL PRICE you paid again for the change. If you cancel the reservation they will also charge you double for a cancellation fee. What douche bags! The only customer service you get from them is rape.
Oh yes, their advertising makes it sound like you are getting a good deal and getting first class service, when in fact they are just greedy bastards taking your money and then fisting you for more later if something happens to need changing.
DO NOT USE TRAVELOCITY FOR ANY TRIPS!!!!!