You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you book a ticket from SEA to DCA? As I need to attend a meeting.

ASSISTANT: Let me know your travel dates.

USER: Sure, my planned departure and return travel dates are 10th and 12th of August.

ASSISTANT: Do you have any preference?

USER: I want to depart in the evening time and I need single connected flight.

ASSISTANT: Is there any airline preference?

USER: No, I don't have any other specifications.

ASSISTANT: Let me know your name.

USER: My name is Larry Roberts.

ASSISTANT: Found ticket with American airlines for price 200 having flight number 1008.

USER: That's fine, proceed for booking.

ASSISTANT: Ticket is booked.

USER: Thank you so much for your help.

ASSISTANT: Thank you.