You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Margaret Campbell.

ASSISTANT: How can I help you?

USER: I have a franchise meeting at Washington. Can you please help me in reserving the ticket from SEA to DCA?

ASSISTANT: Let me know your travelling dates.

USER: I am planning my trip on Jan 18, and again I will return back on Jan 20.

ASSISTANT: Do you have any preference?

USER: My depart time is evening.

ASSISTANT: Connecting flight can be booked with airline UA for price 200 having flight number 1021.

USER: Yes, please go ahead and reserve the ticket.

ASSISTANT: Ticket is booked.

USER: Thank you very much for reserving the ticket.

ASSISTANT: Thanks.