You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, may I know the travelling dates?

USER: My trip dates are July, 11 and July, 13.

ASSISTANT: Do you have any connection limit?

USER: I would prefer single connection.

ASSISTANT: May I know your name?

USER: Dorothy Mitchell 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.