You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

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

ASSISTANT: Sure, may I know your good name?

USER: My name is Barbara Carter.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: Thanks.

ASSISTANT: Thank you for opting us.