You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you for the day?

USER: I want to change my reservation, can you help me with that?

ASSISTANT: Sure, may I know your name?

USER: Sure, I am Christopher Martinez.

ASSISTANT: Sorry, no reservation found with your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.