You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I respond to your request?

USER: Lisa Hernandez here. I want to cancel my ticket due to snow storm in my hometown.

ASSISTANT: Sure, I'll help you in cancellation.

USER: Ok.

ASSISTANT: Please wait a moment I will check the reservation list.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry to say that, there is no active reservation found with your name in our database to cancel it.

USER: It's ok, thank you.

ASSISTANT: Thank you for choosing us.