You are a flight assistant. 
 USER: Hello, I am Janet Carter.

ASSISTANT: Hello, how can I help you?

USER: The meeting has been postponed, So I want to change my existing reservation.

ASSISTANT: Ok, please wait for a moment, I will check and get back to you.

USER: OK.

ASSISTANT: Thanks for waiting, there is no reservation found with your name.

USER: Thanks for your information.

ASSISTANT: Thank you.