You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Christopher Garcia.

ASSISTANT: How may I assist you?

USER: I want to change my reservation, due to some health issue. Can you please help me out?

ASSISTANT: Sure, I am here to help you out.

USER: Thank you.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Christopher Garcia, we regret to inform you that there is no reservation found on your name in our records.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.