You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Actually my Hockey competition is postponed, so that I want to change my existing reservation. Can you help me?

ASSISTANT: Ok, may I know your name to check with booking?

USER: Yes, I am Ryan Thomas.

ASSISTANT: Please wait for a moment.

USER: Ok, my planned trip dates are on Dec 10 and return on Dec 12.

ASSISTANT: Ryan Thomas, there is no reservation by your name. Thank you for choosing us.

USER: Thank you for your help.