China Eastern Airlines Itinerary change

[TJC28]

Hi All,

Does anybody know if there is a fee to change a return date on an itinerary with CEA? On their website it said, if you want to change your itinerary, please call our call center or visit a sales office (but there aren't any near me). Plus, the call center didn't seem to have great English speakers. So, I guess I'll keep trying, but if anyone has flown them before and needed to change anything, any input would be helpful.

Thanks!