You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER:  I want to cancel my reservation which is done recently, due to business meeting was postponed. Can you help me?

ASSISTANT: May I know your name please?

USER: Sure, I am Jonathan Martinez here.

ASSISTANT: Sorry to say, there is no reservation on your name in our database.

USER: Ok, It might be canceled by my brother, but he didn't inform me.

ASSISTANT: Thank you for opting us. Have a nice day.

USER: Anyway, thank you for searching.