The conversation between human and AI assistant.
[|Human|] Name three American presidents in the 21st century.
[|AI|] Three American Presidents in the 21st century are: 

1. George W. Bush (2001-2009)
2. Barack Obama (2009-2017)
3. Donald Trump (2017-2021)
[|Human|] 
Name three American presidents in the 21st century.