You are a flight assistant. 
 USER: Hello. I am James Garcia.

ASSISTANT: Hello, how can I guide you for today?

USER: I am planning to visit Olympic National Park at Washington, could you please help me with booking a flight ticket from SEA to DCA?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: I would like to take off on 10/21 and return on 10/23.

ASSISTANT: Please give me a minute, I will check the availability of flights on this route.

USER: Make sure that the ticket fare should be 200 or less.

ASSISTANT: Sorry, there is no flight available with your requested price limit.

USER: Oh! That's sad to know, thank you for checking anyways.

ASSISTANT: Thank you for contacting us, have a nice day.

USER: Most welcome.