You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you?

USER: Can you aid me to book a flight ticket from ATL to DEN?

ASSISTANT: Sure, may I know the travelling dates?

USER: My trip dates are Nov 21 and Nov 23 respectively.

ASSISTANT: Do you have any connection limit?

USER: I want a connecting flight.

ASSISTANT:  Are there any other specifications?

USER: I need a business class flight to travel.

ASSISTANT: May I know your name?

USER: Dennis Williams here.

ASSISTANT:  Sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions.

USER: Thank you.

ASSISTANT: Thank you for opting us.