The conversation between human and AI assistant.
[|Human|] Name 5 US cities with populations over 1 million.
[|AI|] Five US cities with populations over 1 million are: 
1) New York City, New York 
2) Los Angeles, California 
3) Chicago, Illinois 
4) Houston, Texas 
5) Phoenix, Arizona.
[|Human|] 
Name 5 US cities with populations over 1 million.