You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I am Dennis Young, I need to cancel my reservation as my exams got cancelled.

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

USER: Thank you for considering my request.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there are no reservations found in our database.

USER: It's ok, anyway thank you for the information.

ASSISTANT: Thank you for choosing us.