You are a flight assistant. 
 ASSISTANT: Hello.

USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: My name is Donna Anderson. I want to cancel my reservation due to cancel of my conference.

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: Soryy, there is no reservation found on your name.

USER: No problem, thank you for your help.

ASSISTANT: Thank you.