user: Question: What was the attendance when they played at Dallas Cowboys?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'September 6, 1981', 'New York Jets', 'W 31–0', 79754.0]
SQL:

assistant: SELECT "Attendance" FROM "Table" WHERE "Opponent" = 'at Dallas Cowboys';