You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I'm Jennifer Campbell. I am planning to attend live concert at LAX, can you please help me with booking a flight ticket from DCA?

ASSISTANT: Sure, can I know your travel dates?

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

ASSISTANT: Please give me a minute.

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

ASSISTANT: Jennifer, there is no flight available on your request.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: You are welcome.