You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist?

USER: I'm Brandon Wright. I am planning to attend business meeting at Washington, can you please help me with booking a flight ticket?

ASSISTANT: Sure, I will help you with it. Sure, may I know your travel airport codes please?

USER: My source airport code is SEA and the destination airport code is IAD.

ASSISTANT: Ok, may I know your travel dates?

USER: Sure, I would like to take off on 08/19 and return back on 08/21.

ASSISTANT: Please wait a moment.

USER: Ok, but please make sure that the price limit does not exceed 200.

ASSISTANT: There is a connecting flight with the price limit 200 and the flight number is 1005. Do you want me to book it?

USER: Yes, please proceed with the booking.

ASSISTANT: Your booking is done successfully. Thank you for availing your service.

USER: I appreciate your help, thank you.