You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Alexander King.

ASSISTANT: How can I aid you today?

USER: Can you help me booking a flight ticket from DCA to HOU?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: Thank you. I will start on Mar, 12 and return on Mar, 14.

ASSISTANT: Ok, do you have any other requirements?

USER: I need to start in the afternoon and return in the afternoon.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you.

USER: Sure.

ASSISTANT: I found a flight for you with Spirit Airlines and it costs you 400. Shall I proceed to reserve a seat in this flight?

USER: Please proceed with the booking.

ASSISTANT: Your ticket has been booked with 1014 flight number.

USER: Thank you.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.