user: Question: In what stadium was the home team Dallas Cowboys 21?
Columns: ['Date', 'Visiting team', 'Home team', 'Stadium', 'Regular season / Preseason']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['September 8, 2002', 'Dallas Cowboys 10', 'Houston Texans 19', 'Reliant Stadium', 'Regular season game.']
SQL:

assistant: SELECT "Stadium" FROM "Table" WHERE "Home team" = 'Dallas Cowboys 21';