You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I support you for the day?

USER: I would like to book a flight ticket to visit the Lincoln Memorial in Washington.

ASSISTANT: Do you have any price limit for the booking?

USER: My price limit should be with in 200.

ASSISTANT: Ok, can you please provide me your airport codes?

USER: I will depart from LAS to DCA.

ASSISTANT: May I know your dates of travelling?

USER: I will start on 04/19 and arrival on 04/21. Please book my ticket on the name of James Moore.

ASSISTANT: Ok. Please be on hold.

USER: Sure.

ASSISTANT: I found a flight with UA airline and with the fare of 100. Shall I proceed with the booking?

USER: You can proceed with the booking.

ASSISTANT: Your ticket has been booked with the flight number 1027.

USER: Thank you, for your best service.

ASSISTANT: Thank you for reaching us . Have a nice journey.