You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you now?

USER: I want to cancel my reservation due to heavy snowfall at my destination place, so please help me to cancel.

ASSISTANT: Sure, I am happy to help you with that.

USER: Thank you for accepting my request.

ASSISTANT: Can I have your name please to check existence of your reservation?

USER: Sure, my name is Lisa Williams.

ASSISTANT: Ok, please be on hold for a moment to check your reservation status.

USER: Ok, I will wait.

ASSISTANT: Sorry Lisa Williams, no reservation has found under your name to cancel.

USER: No worries, thank you.

ASSISTANT: Thank you for choosing us, have a good day.