Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_19191 ( "Year" real, "League" text, "Reg. Season" text, "Playoffs" text, "US Open Cup" text, "Avg. Attendance" real )

### Question ###
What was the regular season standings for the year when the playoffs reached the conference semifinals and the team did not qualify for the US Open Cup?

### Accurate SQL ###

SELECT "Reg. Season" FROM table_19191 WHERE "Playoffs" = 'Conference Semifinals' AND "US Open Cup" = 'Did not qualify'