You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you for the day?

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

ASSISTANT: Sure, may I know your travelling dates, please?

USER: The dates of my journey are Sept 27 and 29 respectively.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Can I know your connection limit?

USER: Please book a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: Yes, I need a flight which depart during evening.

ASSISTANT: May I know your name please?

USER: My name is Elizabeth Davis.

ASSISTANT: United Airlines are providing a flight-1004 with single connection limit and the ticket fare is 200. Shall I book it?

USER: As the flight intents you have provided matches my needs, so you can proceed with the booking.

ASSISTANT:  Elizabeth Davis, your booking is confirmed successfully in economy class, the depart time is evening and return time is afternoon.

USER: Thank you for assisting me.

ASSISTANT: Thank you for choosing our agency, have a safe journey.