You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Due to sudden health issue, I would like to cancel my reservation. Can you please help me out with that?

ASSISTANT: Sure, may I know your good name please?

USER: Ok, my name is Joseph Johnson.

ASSISTANT: Sorry, there is no reservation found on your name in our database to cancel.

USER: Oh! I think it might be cancelled by my cousin.

ASSISTANT: Thank you for approaching us.

USER: Anyway, thank you for the information.