user: Question: Who is the Visiting team on December 20?
Columns: ['Date', 'Visiting team', 'Final score', 'Host team', 'Stadium']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['November 22', 'Indianapolis Colts', '31–13', 'Atlanta Falcons', 'Georgia Dome']
SQL:

assistant: SELECT "Visiting team" FROM "Table" WHERE "Date" = 'December 20';