You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: can you please help me to book a flight from SEA to DCA?

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

USER: Sure, I want to depart on Sept 1 and need to return on Sept 3.

ASSISTANT: Do you need break in between your journey?

USER: I need a direct flight.

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

USER: I prefer an business class to travel.

ASSISTANT: May I know your good name please?

USER: Jacob Adams here.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates.

USER: Ok, no problem. Thank you for the information.

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