Booked China Southern Airlines with Trip.com. Arrived ok but return flight was cancelled. China Southern refused to change my flight home as the passenger details (passport number) on ticket was incorrect. This was not picked up on the flight to China from Melbourne. I paid $800 for a one way ticket home. After several months of debate now I am told that I will receive nothing for the cancelled flight. Apparently, 'since the outbound flight fare is higher than the round trip'.