You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Brenda Jackson.

ASSISTANT: Is there any help that you need from my side?

USER: I want to book a flight ticket within a price limit of 500 to watch live sports events at DC-DCA.

ASSISTANT: Sure, may I know your preferable travel dates that you have planned for your journey?

USER: 11/11 and 11/16 are my travelling dates.

ASSISTANT: May I know your source region airport code?

USER: I would like to board from WA-SEA.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Thank you for waiting, there is no flight moving on your journey dates to book a ticket for your journey.

USER: No issue. Thank you.

ASSISTANT: You are most welcome and have a nice day.