user: Question: When was the appointment date for VfL Wolfsburg?
Columns: ['Team', 'Outgoing manager', 'Date of departure', 'Replaced by', 'Date of Appointment']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Hertha BSC', 'Karsten Heine', '19 May 2007', 'Lucien Favre', '1 July 2007']
SQL:

assistant: SELECT "Date of Appointment" FROM "Table" WHERE "Team" = 'VfL Wolfsburg';