You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Ryan Roberts.

ASSISTANT: How can I assist you?

USER: Can you please help me in booking a flight ticket to SEA from DCA?

ASSISTANT: Sure, I can help you with that. May I know your travel dates please?

USER: My travel dates are from Apr 27 to Apr 29.

ASSISTANT: May I know your class preference?

USER: I am comfortable with any class.

ASSISTANT: Do you have any time concerns?

USER: I would like to return in the morning.

ASSISTANT: Please let me know if you have any other specifications.

USER: I need a direct flight.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Sorry to say, there are no direct flights available on those dates with your given details.

USER: Ok, no problem. Thank you.

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