You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Robert Carter from Chicago. Could you please book a flight ticket to Washington with an economy class?

ASSISTANT: Sure, when would you like to depart and return?

USER: I want to depart on 26th July and return on 28th July.

ASSISTANT: May I know your source and destination airport codes?

USER: My source and destination airport codes are ORD and IAD.

ASSISTANT: Do you need halt in between your journey?

USER: Yes, I need a halt in between my journey.

ASSISTANT: Ok, we found an AA airline, class: economy, flight number: 1022, price: 100 with one connection. Shall I proceed to booking?

USER: Yes, proceed.

ASSISTANT: Your flight ticket has been confirmed.

USER: Thank you for your service.

ASSISTANT: Thank you for choosing us.