You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I want to cancel my recent reservation due to sudden postpone of my exams. Can you help me in doing that?

ASSISTANT: Sure, I'll help you in cancellation.

USER: Thank you.

ASSISTANT: Could you please provide me your name to check the reservation status?

USER: Sure, Dennis Hall here.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, I am sorry to say that, there is no active reservation found with your name in our database to cancel it.

USER: Ok, no worries at all. Thank you.

ASSISTANT: Thank you for opting us.