user: Question: What attendance has Astros as the opponent, and April 29 as the date?
Columns: ['Date', 'Opponent', 'Score', 'Loss', 'Attendance', 'Record']
Types: ['text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['March 31', '@ Reds', '4 - 2', 'Harang (0-1)', 42498.0, '1-0']
SQL:

assistant: SELECT "Attendance" FROM "Table" WHERE "Opponent" = 'Astros' AND "Date" = 'April 29';