You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me in booking a flight ticket from IAD to BOS?

ASSISTANT: Sure, help me with the trip dates?

USER: I want to fly on Sept 17 and return on Sept 19.

ASSISTANT: Do you have any preferences?

USER: I need a direct flight.

ASSISTANT: May I know your name please?

USER: My name is Richard Harris.

ASSISTANT: We found a direct flight in an airline Southwest airline with 1019 number price of 100. Shall I reserve it?

USER: You can proceed to booking.

ASSISTANT: Your flight ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for opting us.