You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am John Lewis. I want to cancel my reservation, due to my health issues, so please help me in the cancellation.

ASSISTANT: Sure, I am glad to help you with that. Sorry, I didn't find any reservation on your name in our database.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for reaching us, have a nice day.