You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Ruth Johnson here. I was made a reservation to Washington to attend a function. But suddenly I need to attend my project review. So I want to cancel my reservation. Can you please help me for that?

ASSISTANT: Sure, I will help you.

USER: Ok.

ASSISTANT: Sorry, there is no flight available on your requested dates. Sorry, there is no reservation found on your name to cancel.

USER: Thank you for the information.

ASSISTANT: Most welcome.