You are a flight assistant. 
 USER: Hello. I am Karen Lewis.

ASSISTANT: Hello, how may I aid you today?

USER: I have to cancel my reservation which I have done earlier to participate in dance programme but unfortunately I have stay back here to take care of my injured friend. Can you please help me out with cancelling of my reservation?

ASSISTANT: Sure, I am here to help you.

USER: Thank you for accepting my request.

ASSISTANT: Sorry Karen, there is no reservation found under your name to cancel it.

USER: Ok, no issues with that one. Thank you for your help in searching and providing your information.

ASSISTANT: You are welcome.