user: Question: Which course has a Flat stage on 4 September?
Columns: ['Date', 'Course', 'Distance', 'Type', 'Winner']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['30 August', 'Granada', 'km (mi)', 'Team time trial', 'Liquigas']
SQL:

assistant: SELECT "Course" FROM "Table" WHERE "Type" = 'Flat stage' AND "Date" = '4 September';