user: Question: What is the series of the winning team in Iowa, for Softball?
Columns: ['Date', 'Site', 'Sport', 'Winning team', 'Series']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['September 12, 2008', 'Ames', 'Volleyball', 'Iowa State', 'Iowa State 2–0']
SQL:

assistant: SELECT "Series" FROM "Table" WHERE "Winning team" = 'Iowa' AND "Sport" = 'Softball';