You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Christine Jones. I want to cancel my reservation, can you help me in that?

ASSISTANT: Sure, I will help you.

USER: Thank you.

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

USER: That's ok. might be my brother has cancelled my reservation. Anyway, thank you for your help.

ASSISTANT: You are most welcome.