user: Question: what is the lowest number of sites when the headquarters are in columbus, ga and the rank is smaller than 4?
Columns: ['Rank', 'Circuit', 'Headquarters', 'Screens', 'Sites']
Types: ['real', 'text', 'text', 'real', 'real']
Sample row: [1.0, 'Regal Entertainment Group', 'Knoxville,TN', 7367.0, 580.0]
SQL:

assistant: SELECT MIN("Sites") FROM "Table" WHERE "Headquarters" = 'columbus, ga' AND "Rank" < 4.0;