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 please help me in changing my reservation?

ASSISTANT: Sure, I can help you. May I know your name?

USER: Myself Katherine Baker.

ASSISTANT: Give me a minute.

USER: Ok.

ASSISTANT:  Sorry, we couldn't find a reservation on your name to change.

USER: It's ok, thank you.

ASSISTANT: Thank you for choosing us.