You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I have already reserved my ticket, but right now I want to cancel that reservation. could you please help me?

ASSISTANT: May I know your good name?

USER: I am Christopher Smith.

ASSISTANT: Sure, I will help you out.

USER: Ok.

ASSISTANT: Smith, no reservation found for you.

USER: It's ok.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your helping me.