You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: Can you please help me in cancellation of my ticket which I have done last week?

ASSISTANT: Sure, I will help you with that. May I know your name please?

USER: Thank you and my name is William Miller.

ASSISTANT: I am sorry to say that there is no reservation found under your name.

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching us.