You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, I am happy to help you. Please let me know your travelling dates.

USER: I will start on Dec, 12 and return on Dec, 14.

ASSISTANT: Do you prefer any break in between journey?

USER: I need connecting flight.

ASSISTANT: Are there any other specifications for you?

USER: No.

ASSISTANT: On which name would you like me to book the flight?

USER: Helen Walker here.

ASSISTANT: American Airlines is providing connecting flight with the ticket fare of 100 and depart time is 20:00 hours, arrival time is 1:00 hours. Shall I proceed?

USER: Please proceed.

ASSISTANT: Ok, your ticket is reserved in an economy class and the flight number is 1016.

USER: Thank you.

ASSISTANT: Thank you for choosing us.