You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today from my end?

USER: I am Sharon Jackson. I need to change my existing reservation due to postpone of my event. Could you please help me?

ASSISTANT: Sure, I am here to help you out. Please allow me a moment to check the reservation status on your name.

USER: Sure.

ASSISTANT: Sorry Sharon Jackson, there is no active reservation on your name in our database.

USER: No worries, thank you for the information.