You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I'm Brandon Phillips. I am planning to attend music concert at DFW, can you please help me with booking a flight ticket from DCA?

ASSISTANT: Sure, please share your travel dates.

USER: Sure, I would like to take off on 04/03 and return back on 04/05.

ASSISTANT: Please give me a minute.

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

ASSISTANT: The flight 1023 of AA airlines is available on your requested dates with a price of 100.

USER: Yes, please proceed with the booking.

ASSISTANT: Brandon, your reservation has been done successfully.

USER: Thank you for your help.

ASSISTANT: You are welcome.