You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER:  I made a reservation earlier this week to give a seminar, but my seminar has been postponed. Can you help me to change it?

ASSISTANT: Sure, We are here to help you. May I know your name?

USER: Sure, my name is Richard White.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: Thanks for your time. We didn't found any reservation by this name.

USER: Ok, thanks for your information.

ASSISTANT: Thank you.