You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Dorothy Clark.

ASSISTANT: What can I do for you?

USER: I just want to cancel my recent reservation, because my seminar was postponed.

ASSISTANT: Sure, I will help you, please wait a moment.

USER: Ok.

ASSISTANT: No reservation found on your name Dorothy Clark.

USER: Ok, that's fine.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your services.