user: Question: What is the date of vacancy for the person that left because of End of caretaker contract?
Columns: ['Team', 'Outgoing manager(s)', 'Manner of departure', 'Date of vacancy', 'Position in table', 'Replaced by', 'Date of appointment']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Eintracht Frankfurt', 'Friedhelm Funkel', 'Resigned', '21 May 2009', 'off-season', 'Michael Skibbe', '1 July 2009']
SQL:

assistant: SELECT "Date of vacancy" FROM "Table" WHERE "Manner of departure" = 'End of caretaker contract';