user: Question: What was the date in which Behtash Fariba left his team?
Columns: ['Team', 'Outgoing manager', 'Manner of departure', 'Date of vacancy', 'Replaced by', 'Date of appointment']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Kowsar', 'Reza Ahadi', 'Sacked', '2009', 'Mostafa Ghanbarpour', '2009']
SQL:

assistant: SELECT "Date of vacancy" FROM "Table" WHERE "Outgoing manager" = 'Behtash Fariba';