user: Question: Who is the visitor team on 23 November 2007?
Columns: ['Date', 'Visitor', 'Score', 'Home', 'Leading scorer', 'Attendance', 'Record']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['2 November 2007', 'Mavericks', '94–101', 'Hawks', 'Dirk Nowitzki (28)', 19767.0, '1–1']
SQL:

assistant: SELECT "Visitor" FROM "Table" WHERE "Date" = '23 November 2007';