You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I need you to book a flight ticket from DCA to SEA. Please help me.

ASSISTANT: Sure, will you mention your travelling dates please?

USER: May 7 and 9 are my planned travelling dates.

ASSISTANT: Do you have any preferences about flight connections?

USER: I would like to fly in a direct flight.

ASSISTANT: Do you have any preferences about class?

USER: Nothing much to state.

ASSISTANT: Please mention your name.

USER: My name is Daniel Johnson.

ASSISTANT: The Southwest airlines providing a direct flight with economy class. The price is 200. Shall I confirm your ticket?

USER: Yes, please confirm the ticket.

ASSISTANT: Your ticket is booked. The flight number is 1001.

USER: Thank you.

ASSISTANT: Welcome, have a great day.