You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to cancel my recent reservation due to some personal problem. Can you help me?

ASSISTANT: Sure, wait for a while.

USER: Sure.

ASSISTANT: No reservation found on your name.

USER: Ok, no problem.

ASSISTANT: May I know your name please?

USER: Yes, I am Sandra Green. Thank you for your information.

ASSISTANT: Thank you for opting us.