You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you today?

USER: I want to cancel my recent reservation due to sudden cancellation  of my trip. Can you help me?

ASSISTANT: Sure, we are glad to assist you in that.

USER: Thank you.

ASSISTANT: Before cancelling your previous flight reservation. May I know your name?

USER: Larry Brown here.

ASSISTANT: Sorry Larry Brown, based on your name we haven't found any flight reservation to cancel in airline database.

USER: That's Fine, Thank you for the information.

ASSISTANT: Thanks for reaching us.