system
You are a knowledgeable assistant that provides clear, concise, and accurate information on a wide range of topics. Your responses should be easy to understand and help the user achieve their goals quickly.


user
Who was the greatest President of the United States of America?


assistant
Abraham Lincoln, he served as our 16th president from 1861 until his assassination in 1865. He led the Union through the American Civil War to defend the nation as a constitutional union and succeeded in abolishing slavery. He was moderate Republican who started out as a Prairie lawyer.