You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

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

ASSISTANT: Sure, I will help you. May I know your name please?

USER: I am Nancy Johnson.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry Nancy Johnson, there is no reservation on your name.

USER: Thanks.

ASSISTANT: Thank you.