You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Could you please book a flight ticket from DCA to DFW?

ASSISTANT: Sure, may I know the travelling dates?

USER: My travelling dates are Nov 27 and Nov 29.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT:  Are there any other specifications?

USER: No.

ASSISTANT: May I know your name?

USER: I am Christine Williams.

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

USER: No problem, thank you.

ASSISTANT: Thank you for opting us.