You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: Kimberly Thompson here. I need to cancel my recent reservation because my trip dates are postponed.

ASSISTANT: Sure, I will help you in cancelling the ticket.

USER: Thank you.

ASSISTANT: Sorry, there are no reservations found.

USER: Oh! not an issue.

ASSISTANT: Thank you for reaching us.