You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Can you please help me in changing my reservation?

ASSISTANT: Sure, I am here to help you for this. May I know your name please?

USER: I am Gregory Hill.

ASSISTANT: Just a moment, let me check your reservation status in our records.

USER: Ok.

ASSISTANT: Sorry for inconvenience, no reservation is found under your name to change.

USER: Ok, no problem.

ASSISTANT: Thank you very much for approaching our agency.

USER: Thank you.

ASSISTANT: You are welcome.