type "barnum statements" into google and you will get a wealth of information on things to say that will sound accurate to the one being told their fortune.
example...
"You have a need for other people to like and admire you, and yet you tend to be critical of yourself. While you have some personality weaknesses you are generally able to compensate for them. You have considerable unused capacity that you have not turned to your advantage. At times you have serious doubts whether you have made the right decision or done the right thing."