You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Lisa Johnson. Due to some weather problems I need to cancel my recent reservation, Can you please help me with that?

ASSISTANT: Please wait a while, I will check and inform you.

USER: Sure.

ASSISTANT: Sorry to say, there is no reservation on your name in our database.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for opting us. Have a nice day.