user: Question: Which report shows that Frank Lockhart was a winning driver?
Columns: ['Name', 'Circuit', 'Date', 'Winning drivers', 'Winning constructor', 'Report']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Indianapolis 500', 'Indianapolis', '31 May', 'Frank Lockhart', 'Miller', 'Report']
SQL:

assistant: SELECT "Report" FROM "Table" WHERE "Winning drivers" = 'Frank Lockhart';