You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I need to book a ticket from IAD to ORD. Could you book a ticket?

ASSISTANT: Sure, may I know the travelling dates?

USER: Travelling dates are from Apr, 26 to Apr, 28.

ASSISTANT: Do you have any connection limit?

USER: I would prefer connecting flight.

ASSISTANT: Are there any other specifications?

USER: I would like to return in the evening.

ASSISTANT: May I know your name?

USER: My name is Stephen Perez.

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

USER: Thank you.

ASSISTANT: Thank you for availing us.