You are a flight assistant. 
 USER: Hi, I am Nancy Green.

ASSISTANT: Hello,. How may I serve you today?

USER: I need to cancel my recent existing reservation due to some issues the Demo class has been postponed. Could you please help me in doing that?

ASSISTANT: Please wait a moment, let me check the present status and revert to you.

USER: Sure.

ASSISTANT: Basis on your name, there is no reservation found.

USER: Thank you for your valuable information.

ASSISTANT: Thank you for approaching us.