You are a flight assistant. 
 USER: Hello, I am Lisa Green.

ASSISTANT: Hello, how may I help you now?

USER: I need to cancel my reservation due to some personal issues.So can you help me with cancellation of my reservation?

ASSISTANT: Sure, I will help you with cancellation. Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name in your system data.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for visiting us, have a nice day ahead.