You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

USER:  I am Jack Lopez want to cancel my reservation due to heavy snow storm.

ASSISTANT: Sure, I will help you. Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your given name.

USER: Thank you for your help.

ASSISTANT: Thanks for choosing us.