You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Betty Allen.

ASSISTANT: How may I help you for today?

USER: I want to change my recent reservation as my seminar location is changed.

ASSISTANT: Sure, please hold on for a moment so that I can check the details of your existing reservation.

USER: Sure, take your time.

ASSISTANT: Sorry Betty, there is no existing reservation which was made on your name.

USER: That's fine.

ASSISTANT: Thank you, have a good day.

USER: Thank you for your time.