You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Jonathan Lewis here.

ASSISTANT: May I know your concern?

USER: I am looking for a flight ticket with price below 500. Can you book it?

ASSISTANT: Yes Mr. Jonathan Lewis, may I know your travel dates to check the availability of flights?

USER: My preferable dates for travel are 11/25 to 11/27. I am looking for a connecting flight.

ASSISTANT: Ok, please may I know location airport codes to book?

USER: My airport codes for boarding the flight are DEN to IAD.

ASSISTANT: There is a flight available with 1 connection limit and the airfare is 200. Can I book the flight 1009?

USER: I am happy with the cost of the flight ticket as well. So you can proceed.

ASSISTANT: Ok, the flight is booked and the airlines is Southwest. Thank you for choosing our agency.

USER: Thank you.