user: ### NOW ANSWER:
Question: What were the placements of the team in regular season when they reached Quarterfinals in the U.S. Open Cup but Did not qualify for the Concaf Champions Cup?
Columns: ['Season', 'MLS Reg. Season', 'MLS Cup Playoffs', 'U.S. Open Cup', 'CONCACAF Champions Cup / Champions League']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1997.0, '1st, West (14-11)', 'Lost Conference Semifinals [Colorado Rapids 0-2)', 'Round of 16', 'Did not qualify']
SQL:

assistant: SELECT "MLS Reg. Season" FROM "Table" WHERE "U.S. Open Cup" = 'Quarterfinals' AND "CONCACAF Champions Cup / Champions League" = 'Did not qualify';