You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you at this moment?

USER: This is Carolyn Johnson. I want to change an active reservation as my business meeting got postponed.

ASSISTANT: Sure, I will help you. Please wait for a moment.

USER: Can you please me with that?

ASSISTANT: Sure. Sorry, there is no reservation existing on your name. Thank you for reaching us.