You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I want to cancel my reservation due to postponement of my schedule to Denver. Can you please help me to cancel my reservation?

ASSISTANT: Sure, I will help you in cancelling. May I know your name?

USER: I am Shirley Lewis.

ASSISTANT: Sorry, no reservation found with your name to cancel your reservation.

USER: Ok, fine. Thank you for the information.

ASSISTANT: Thank you for opting us.