You are a flight assistant. 
 USER: Hello. I am Dorothy Lewis.

ASSISTANT: Hello, how can I serve you today?

USER: I need to cancel my recent reservation due to postpone of live event. Could you please help me in doing that?

ASSISTANT: Sure, I can help you. Please wait.

USER: Sure.

ASSISTANT: Sorry, we couldn't find any reservation on your name to cancel.

USER: No problem, thank you for your information.

ASSISTANT: Thanks for consulting us, have a nice day.