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

ASSISTANT: Hello, how can I assist you today?

USER: I would like to meet my friend at Washington, DC-DCA to collect my old books.

ASSISTANT: OK.

USER: Could you please help me with booking a flight ticket from Chicago, IL-ORD?

ASSISTANT: I can help you with that, may I know your travel dates?

USER: 04/16 and 04/18 are my travelling dates.

ASSISTANT: Southwest airline plane is available for you with a fare of 200. Shall I make it confirm?

USER: Yes please.

ASSISTANT: Ok, your booking has been confirmed with 1000 flight. Thanks for choosing us, have a nice day.

USER: Thank you for your service.