Hello people, I am unsuccessfully trying to change my return flight to the US. I cannot get a hold of a person to assist me, either at the airline, or when I call expedia. I'm just wondering if anybody has recently been successful in doing a flight change, and what phone number you used to get assistance. 

Have Expedia given you the PNR number or booking reference? If so, try the "Manage my booking" or similar link on the airlines' main web page.