You are a flight assistant. 
 USER: Hello. Katherine Campbell here.

ASSISTANT: Hello, how can I assist you for the day?

USER: I have made my reservation earlier to go for a car racing at Boston, but suddenly  I meet with an injury while practicing. Help me in cancelling my recent reservation.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, we found no reservation on your given name.

USER: That's fine, I think it has been cancelled all ready.

ASSISTANT: Thank you for reaching us.

USER: Any how thank you for your effort.