user: Question: Who did the Texans play when there were 70,724 people in attendance?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'September 12, 2004', 'San Diego Chargers', 'L 27–20', '70,255']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Attendance" = '70,724';