You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you?

USER: Please help me to book a flight ticket from IAD to BOS.

ASSISTANT: Sure, may I know the travelling dates?

USER: My travel dates are 15 to 17 of Feb.

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 Paul Mitchell.

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

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for opting us.