You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you today?

USER: I would like to book a ticket from SEA to DCA, can you help me?

ASSISTANT: Sure, we are here to help you with that. Can you please share your preferable travel dates?

USER: My travel dates are 16 and 18 of May.

ASSISTANT: May I know your name please?

USER: Myself Samantha Harris.

ASSISTANT: Is there any airline preference?

USER: No.

ASSISTANT: Do you have any other specifications?

USER: I want a direct flight.

ASSISTANT: Sorry to say that, there are no flights available on this route as per your travel dates.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for reaching us, have a great day.