You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How can I aid you?

USER: Please change my existing reservation, owing to an emergency.

ASSISTANT: Sure. May I know your name?

USER: I am Brandon Nelson.

ASSISTANT: Wait a minute.

USER: Ok.

ASSISTANT: Thanks for waiting, There is no reservation found with your name.

USER: Thanks.

ASSISTANT: Thank you.