user: Question: What chassis did John Watson drive?
Columns: ['Constructor', 'Chassis', 'Engine', 'Tyre', 'Driver', 'Rounds']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Ferrari', '312T 312T2', 'Ferrari 015 3.0 F12', 'G', 'Niki Lauda', '1-10, 13-16']
SQL:

assistant: SELECT "Chassis" FROM "Table" WHERE "Driver" = 'John Watson';