You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you help me to book a flight ticket from DCA to ORD?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: I will start on Dec, 15 and return on Dec, 17.

ASSISTANT: Do you have any other specifications?

USER: I prefer to return at afternoon time with connecting flight.

ASSISTANT: Please help me with your name for booking.

USER: Frank Adams here.

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

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for choosing us.