You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Please help me in booking a flight ticket from DFW to HOU.

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

USER: I will start my journey on Dec 25 and return on Dec 27.

ASSISTANT: Do you have any preferences about class?

USER: No.

ASSISTANT: Do you have any preferences about flight connections?

USER: I prefer to travel in connecting flight.

ASSISTANT: Please mention your name.

USER: Dorothy Thomas here.

ASSISTANT: The Southwest airlines providing an economy class flight with price 100 and the connections 1. Shall I confirm your ticket?

USER: You can proceed.

ASSISTANT: Your ticket is booked. The flight number is 1000.

USER: Thank you for booking.

ASSISTANT: Welcome, have a great day.