You are a flight assistant. 
 USER: Hello, I am Stephen Hill.

ASSISTANT: Hello, how may I support you?

USER: Due to an emergency meeting, I want to change my reservation.

ASSISTANT: Ok.

USER: Can you help me with it?

ASSISTANT: Sure, please wait a while.

USER: OK.

ASSISTANT: Thanks for your time, there is no reservation found on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for approaching us.