user: Question: When did the season start that ended with the top record of Lindenwood (20–0–0)?
Columns: ['No.', 'Season', 'Championship', 'No. of teams', 'Start (reg. season)', 'Finish (incl. championship)', 'Top record', 'National Champion']
Types: ['real', 'text', 'real', 'real', 'text', 'text', 'text', 'text']
Sample row: [1.0, '2003–04', 2004.0, 66.0, 'October 4', 'April 18', 'Lindenwood (21–0–1)', 'Lindenwood']
SQL:

assistant: SELECT "Start (reg. season)" FROM "Table" WHERE "Top record" = 'Lindenwood (20–0–0)';