You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I am David Garcia. I need to amend my reservation, can you help me out?

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: Please give me a moment to check your previous reservation.

USER: Sure.

ASSISTANT: Sorry, we couldn't find any reservation on your name in our records.

USER: That's ok, no problem. Thank you for your help.

ASSISTANT: Thank you for consulting us.