You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am Gary Garcia, I would like to change my recent reservation, can you help me?

ASSISTANT: Hold on a moment please.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name to change it.

USER: That's fine, thanks for your information.

ASSISTANT: Thanks for choosing us, have a nice day.