Hi.
Hello, how can I assist you?
I am Larry Carter. I am planning to travel from DFW to DEN, can you help in booking  a flight for me?
Sure, I am here to help you out. Please provide us your trip dates.
My travelling dates are 07/18 to 07/20.
Ok, please be on hold for a while.
Sure.
Sorry, there is no flight available as per your given dates.
That's ok, thank you for your help.
You are welcome and thank you for choosing us.