You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I need to cancel my reservation due to bad weather condition. Can you aid me in cancellation process?

ASSISTANT: Sure, I am glad to serve you.

USER: Thank you.

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

USER: Joseph Thompson here.

ASSISTANT: Sorry Joseph Thompson. We haven't found any previous reservation to cancel on your name.

USER: No problem, thank you for searching.

ASSISTANT: Thanks for reaching us.