You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Anna Collins here.

ASSISTANT: How can I assist you today?

USER: I would like to visit Seattle for a business meeting, so can you please help me out with booking of a flight ticket to go there?

ASSISTANT: Sure, can you please share your preferable travel dates?

USER: I am planning to go on 02/15 and please book a return ticket on 02/17.

ASSISTANT: Could you please provide the airport codes?

USER: Sure, I want to travel from DCA to SEA.

ASSISTANT: Please allow me a moment to check for the availability of flight on this route.

USER: Sure, take your time.

ASSISTANT: Anna, there is a flight available with price 800 and the connection is 1 with UA airline. Would you like me to proceed with the booking?

USER: It's perfect, you can proceed with booking.

ASSISTANT: Your booking is confirmed with 1018 flight number.

USER: Thank you for your assistance.

ASSISTANT: Thank you for choosing our service.

USER: Welcome.