You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER:  I want to cancel my recent reservation which I have done last week because my trip got cancelled. Please help me out with that.

ASSISTANT: Sure, I will help you with cancellation.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Myself Joseph Collins.

ASSISTANT: Please wait for a moment.

USER: Sure.

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

USER: It's ok, thank you for your help.

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