user: Question: Which date was a Rest day?
Columns: ['Date', 'Course', 'Distance', 'Type', 'Winner']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['7 May', 'Reggio Calabria', 'km (mi)', 'Individual time trial', 'Brett Lancaster ( AUS )']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Course" = 'Rest day';