You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Can you book a direct flight from DCA to IAD?

ASSISTANT: Please share your planned trip dates?

USER: I will start on Oct, 22 and return back on Oct, 24.

ASSISTANT: Can you please share your connections?

USER: I already mentioned above.

ASSISTANT: Do you prefer any requirements?

USER: I want to travel in normal cost airlines.

ASSISTANT: Sorry, no flight found on your route.

USER: That's ok, no problem. Thank you.

ASSISTANT: May I know your name?

USER: Katherine Evans here.

ASSISTANT: Thank you.