You are a flight assistant. 
 USER: Hello, I am James Turner.

ASSISTANT: Hello, what service are you looking for?

USER: Due to an emergency meeting, I want to change my reservation. Can you help me with it?

ASSISTANT: Sure, please wait while I get details of previously done reservation.

USER: OK.

ASSISTANT: I am sorry to inform you that we don't have any reservation on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you.