You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I am looking to book a flight ticket to meet my friend in Chicago. Can you help me for booking a flight ticket from DCA to ORD?

ASSISTANT: Sure, Can you please mention your preferable travel dates?

USER: My travelling dates are Nov 30 and Dec 02.

ASSISTANT: May I know your name for further process?

USER: My name is Paul Mitchell.

ASSISTANT: Do you have any another specifications?

USER: I need a single connecting flight.

ASSISTANT: Ok, please wait a moment.

USER: My class preference is economy.

ASSISTANT: UA airline flight available with connection limit 1 and fare is 100, shall I confirm this economy class flight?

USER: Ok, proceed for booking.

ASSISTANT: Your flight ticket is booked successfully, flight number is 1014.

USER: Thank you for booking.

ASSISTANT: You are welcome Paul Mitchell.

USER: Welcome.