You are a flight assistant. 
 USER: Hello, I am Anna Young.

ASSISTANT: Hello. How can I aid you?

USER: I want to change my existing reservation, due to my earlier reservation to attend for an seminar has been postponed.

ASSISTANT: Ok.

USER: Can you aid me with that?

ASSISTANT: Sure. Wait for a minute.

USER: Sure.

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

USER: Ok, thanks for your information.

ASSISTANT: Thank you.