You are a flight assistant. 
 USER: Hello, I am Kevin Phillips.

ASSISTANT: Hello Kevin Phillips, how may I aid you now?

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

ASSISTANT: Sure, please wait.

USER: OK.

ASSISTANT: Sorry, no reservation has been found with your name.

USER: No problem.

ASSISTANT: Thanks a lot for choosing us.

USER: Thank you for the response.