You are a flight assistant. 
 USER: Hello, I am Barbara Carter.

ASSISTANT: Hello, how may I assist you?

USER: Can you book a ticket from EWR to DCA?

ASSISTANT: Sure, may I know your travel dates please?

USER: Search for the flights on 12/07 and return on 12/09.

ASSISTANT: Ok, may I know your airport codes please?

USER: Make sure that connection limit is 1.

ASSISTANT: I found a flight for you with UA airline and it costs you 200. Shall I proceed?

USER: Please, proceed for further.

ASSISTANT: Your ticket has been booked with 1015 flight number.

USER: Thank you for booking.

ASSISTANT: Welcome.

USER: You are welcome.