user: Question: What regular season did the team reach the Conference Semifinals in the playoffs?
Columns: ['Year', 'Division', 'League', 'Regular Season', 'Playoffs', 'Open Cup']
Types: ['real', 'real', 'text', 'text', 'text', 'text']
Sample row: [2008.0, 4.0, 'USL PDL', '2nd, Northeast', 'Conference Semifinals', 'Did not qualify']
SQL:

assistant: SELECT "Regular Season" FROM "Table" WHERE "Playoffs" = 'Conference Semifinals';