I am thinking about adopting a border collie
Border collies are my favorite breed! There such good work dogs.
Have you ever owned one?
Yes, I have. They're very energetic and intelligent dogs.
That's great to hear! Are they easy to train?
They are one of the smarted of all dog breeds, so yes, they are very easy to train.
Great. I feel even better about my choice, then.
Just keep in mind, they are a work dog, and tend to be extremely energetic. 
I will make sure to keep her busy to burn off energy.
I also hope you aren't afraid of some dog hair! They have a thick coat and shed often.