You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you help me to book a flight ticket from IAD to DEN?

ASSISTANT: Sure, may I know the travelling dates?

USER: My travel dates are June, 10 and June, 12.

ASSISTANT: Do you have any connection limit?

USER: I would prefer single connection.

ASSISTANT: May I know your name?

USER: Sarah Turner 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 opting us.