You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to book a ticket from SEA to DCA. Can you please help me out?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: I am planning to travel on Mar 24 and return back on Mar 26.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I am looking for a direct flight.

ASSISTANT: May I know your good name please?

USER: My name is Paul Brown.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for reaching us.