You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

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'm glad to help you with that. May I know your good name please?

USER: I am Lisa Smith.

ASSISTANT: Lisa Smith, I found your reservation and I have successfully cancelled it.

USER: Thank you for your kind service.

ASSISTANT: Thank you for choosing us.