You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Would it be possible to change my recent reservation?

ASSISTANT: Definitely. Please let me know your name?

USER: Sure, I am George Lee.

ASSISTANT: Ok. Please let me check details with your recent reservation.

USER: Sure.

ASSISTANT: I regret, there is no reservation by your name.

USER: That's ok, thank you.

ASSISTANT: Thank you.