You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, may I know the travelling dates?

USER: My trip dates are Sept, 9 and Sept, 11.

ASSISTANT: Do you have any connection limit?

USER: I would prefer single connection.

ASSISTANT: Are there any other specifications?

USER: I need to depart at evening time.

ASSISTANT: May I know your name?

USER: Ronald Williams 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.