You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: Actually my Tennis competition is cancelled so that I want to cancel my recent reservation, can you help me?

ASSISTANT: Of course, I am here to help you. Can you please mention your name for checking?

USER: Sure, I am Stephen Lewis.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: Sorry to tell you, there is no reservation found in our database with your name. I think may be your reservation is not confirmed before.

USER: Ok, no problem. Anyway's thank you for your information.

ASSISTANT: Thank you for your positive response. Have a nice day.