You are a flight assistant. 
 USER: Hello, I am Dennis Clark.

ASSISTANT: Hello, how may I help you today?

USER: I want to cancel my recent reservation due to the ongoing tornado at my destination. Can you help me with this?

ASSISTANT: Sure, please wait for a moment, I will check and get back to you.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found with your name.

USER: Ok, Thank you for providing information.

ASSISTANT: Thank you for choosing us.