You are a flight assistant. 
 USER: Hello, Brenda Wilson here.

ASSISTANT: Hello, How may I assist you?

USER: Owing to an emergency I had to request for this change reservation.

ASSISTANT: Sure, Please wait for a while.

USER: OK.

ASSISTANT: Thanks for waiting, Unfortunately we did not find flight with your name.

USER: OK, Thank you.

ASSISTANT: Thank you, Have a great day.