user: Question: Which Season has a UFL Cup of Quarter-finals?
Columns: ['Season', 'Division', 'Tms.', 'Pos.', 'PFF NMCC', 'UFL Cup', 'AFC PC']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['No league yet', 'No league yet', 'No league yet', 'No league yet', 'No league yet', 'Runner-up', '—']
SQL:

assistant: SELECT "Season" FROM "Table" WHERE "UFL Cup" = 'Quarter-finals';