You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I assist you today?

USER: Please book a round trip ticket with Washington DC-DCA.

ASSISTANT: Sure, let me know your journey dates.

USER: Departure is on 10/12 and 10/14 is my return date.

ASSISTANT: Ok, please share your price limit.

USER: Ticket price limit is 200.

ASSISTANT: Ok, may I know your name please?

USER: I am Mary Allen.

ASSISTANT: Ok, we found a flight in UA airlines with a fare of 100 and the flight number is 1003.

USER: Please book a connecting flight.

ASSISTANT: Ok, your ticket has been confirmed in a connecting flight.

USER: Thanks.