You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to cancel my reservation, can you help me?

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

USER: I am Nancy Brown.

ASSISTANT: Sorry, I did not find any reservation on your name.

USER: Thank you.

ASSISTANT: Welcome, have a nice day.