You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello,. How can I aid you today?

USER: I would like to change my reservation.

ASSISTANT: Sure, may I know your name please?

USER: Matthew Parker.

ASSISTANT: OK, wait for a while. Sorry, we have not found any reservation on your name?

USER: My new reservation is from Boston MA-BOS to New York NY-EWR. Thanks for your assistance.