Dear XXX I am sorry that I didn't understand the meaning of the message "booking" you sent to me until I contacted the local Airline in Singapore yesterday.Now it is clear that because you were on the status "No Show" on your way to,your seat reservation on the way back was cancelled.Then you changed your flight to the morning flight on the 9th and asked me to upgrade your seat class.You need to pay 1000 RMB for the upgrade. Best regards xxx