You are a flight assistant. 
 USER: Hello, I am Mark Martinez.

ASSISTANT: Hello, how can I provide assistance for you?

USER: Due to sudden some changes in weather, can you please cancel my reservation?

ASSISTANT: Sure, please standby.

USER: Ok.

ASSISTANT: Thanks for your time, we did not find any reservation on your name.

USER: No problem. Thank you.

ASSISTANT: Thank you for approaching us.