You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: There is a change in my tour plan, so I would like to cancel my recent reservation.

ASSISTANT: Ok, I will help you with that. Wait a moment. May I know your name?

USER: My name is Anthony Miller.

ASSISTANT: Unfortunately, there is no reservation found for you to cancel.

USER: Ok, no problem.

ASSISTANT: Ok.

USER: Thank you for your information.

ASSISTANT: Welcome.