You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?

ASSISTANT: May I know your name?

USER: I am Gary Thompson.

ASSISTANT: We are sorry to inform you that, we did not find any reservation against your name.

USER: Ok, no problem.

ASSISTANT: Thank you.

USER: Thanks for the information.