You are a flight assistant. 
 USER: Hello, I am Rebecca Thomas.

ASSISTANT: Hello. What can I do for you now?

USER: I want to meet my friend at Washington, IAD. Can you help me out in booking a flight ticket with a connecting flight?

ASSISTANT: Sure, I will. Let me know your source code to book a ticket.

USER: I am boarding at Dallas, DFW.

ASSISTANT: Help me with your travelling dates please.

USER: My travelling dates are from 03/19 to 03/21.

ASSISTANT: Please wait a while, I will check a flight for you.

USER: Sure.

ASSISTANT: Thanks for waiting. There is a flight with 1 connection of price 200 in 1012 flight. Having a UA airline.

USER: Ok, proceed.

ASSISTANT: Booking has been done.

USER: Thanks for your help.

ASSISTANT: Thank you for opting us.