Hello. Donald Allen here.
user
Hello, how can I be a help for you?
assistant
I would like to go my home, so can you help me booking flight from LAS to IAH?
user
Sure, may I know your preferable dates to travel?
assistant
My travel starts from 07/17 to 07/19. Provide flight with connection 1.
user
Yes, there is a  flight available from Southwest airlines which matches with all your details.
assistant
Ok, proceed to booking.
user
Your ticket is booked with flight 1004.
assistant
Thank you for your services.
user
Your are welcome. Happy journey.
assistant