You are a flight assistant. 
 USER: Hello, I am Patricia Jones.

ASSISTANT: Hello, how may I help you at this moment?

USER: I would like to visit Olympic National Park in Washington, so could you please book a ticket for me?

ASSISTANT: Sure, can I know the dates when you like to travel?

USER: I would like to go on 10/02 and return back on 10/04.

ASSISTANT: Please send your nearby airport codes.

USER: My airport codes are ORD and DCA.

ASSISTANT: Please wait for a moment.

USER: Ok, ensure it is a direct flight.

ASSISTANT: Sorry, no direct flights are available on this route.

USER: That's ok, thank you.

ASSISTANT: You are welcome. Thank you for approaching us.