You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I aid you?

USER: My wife is sick, so I need to change an existing reservation.

ASSISTANT: OK, may I know your name?

USER: My name is Michelle Roberts.

ASSISTANT: OK, Please wait, I will let you know about reservation. Sorry, there is no reservation on Michelle Roberts.

USER: That's not a problem, thank you.

ASSISTANT: Thank you for reaching us.