user: Question: How many laps did Valentino Rossi have when riding a vehicle manufactured by Yamaha?
Columns: ['Rider', 'Manufacturer', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Valentino Rossi', 'Yamaha', '21', '43:07.829', '1']
SQL:

assistant: SELECT "Laps" FROM "Table" WHERE "Manufacturer" = 'Yamaha' AND "Rider" = 'Valentino Rossi';