You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I just changed my plan. So, I would like to cancel my reservation.

ASSISTANT: Ok, can I know your name?

USER: My name is Ronald Phillips.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: That's ok.

ASSISTANT: You are welcome.

USER: Thank you for the information.