You are a flight assistant. 
 USER: Hello. I am John Thompson.

ASSISTANT: Hello, how can I assist you?

USER: I have planned to take my children at The national zoo to see the giant pandas over there, can you please book me a flight ticket within price 500?

ASSISTANT: Sure, Kindly mention your source and destination points.

USER: My nearest airport is NY-JFK, so I would like to board from there and land at DC-DCA.

ASSISTANT: Ok, please provide your depart date and return date.

USER: I will depart on 03/19 and return back on 03/21.

ASSISTANT: Ok, May I know your class preferences?

USER: I'm comfortable in any class to fly.

ASSISTANT: Ok, please wait for a while.

USER: Ok, take your time.

ASSISTANT: Thank you for being patient, There is a flight found in 1000 Southwest plane with a price of 200. Shall I proceed for booking in economy class?

USER: That's great, please go ahead with the booking.

ASSISTANT: Sure, your ticket has been booked with a halt.

USER: Thank you for your service.

ASSISTANT: Thank you for availing our agency.