You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Janet Miller.

ASSISTANT: How may I assist you?

USER: Due to sudden changes, my seminar has been postponed. Can you please change my reservation?

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there is no active reservation on your name.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you.