user: Question: What is the date of the tournament at Hokkaidō with prize of ￥150000000?
Columns: ['Dates', 'Tournament', 'Location', 'Prize fund ( ￥ )', 'Winner', 'OWGR pts']
Types: ['text', 'text', 'text', 'real', 'text', 'real']
Sample row: ['Apr 15-18', 'Token Homemate Cup', 'Mie', 130000000.0, 'Koumei Oda (4)', 18.0]
SQL:

assistant: SELECT "Dates" FROM "Table" WHERE "Location" = 'Hokkaidō' AND "Prize fund ( ￥ )" = 150000000.0;