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_66472 ( "Rank:" real, "State:" text, "Premier:" text, "Party:" text, "Assumed office:" text, "Left office:" text, "TOTAL Time in office:" text )

### Question ###
Premier Sir Charles Cowper (1807-1875) KCMG left office 2 October 1856, when did he assume office?

### Accurate SQL ###

SELECT "Assumed office:" FROM table_66472 WHERE "Premier:" = 'sir charles cowper (1807-1875) kcmg' AND "Left office:" = '2 october 1856'