You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

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

ASSISTANT: Sure, may I know your name to check?

USER: Thank you for accepting my request, I had reserved it on the name of Anthony Williams.

ASSISTANT: Sorry, there is no active reservation found under your name to cancel.

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

ASSISTANT: Thank you for reaching us.

USER: Anyway, thank you for checking.

ASSISTANT: Thank you.