You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Dorothy Roberts. Can you help me to cancel my recent reservation due to some personal work.

ASSISTANT: Sure, just a moment please.

USER: Sure.

ASSISTANT: I am sorry no reservation found on your name.

USER: That's fine, thanks for your information.

ASSISTANT: Thank you for choosing me.