You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know your name please?

USER: Myself Sharon Robinson.

ASSISTANT: Yes, how can I help you?

USER: I would like to change my existing reservation because my seminar was postponed.

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found by your name.

USER: Ok, no problem.

ASSISTANT: Do you want any more information please?

USER: No, thank you for your services.

ASSISTANT: Thank you and have a nice day.