Hello, Elizabeth Allen here.
Hello, how may I help you?
Is there any best airlines that could travel from DEN to ATL?
 Which airline would you like to use? May I know your journey dates?
I prefer to travel on 08/27 to 08/29 with AA airline.
Sure, let me check the availability from AA airlines.
Ok.
I have found a flight from Southwest airlines are providing service. Do you fine with that?
Yes, please proceed.
Sure. Your ticket has been booked, have a happy journey.
Thank you for your services.
Most welcome.