user: Question: What is the appointment day for 4 December 2008 vacancy?
Columns: ['Team', 'Outgoing manager', 'Manner of departure', 'Date of vacancy', 'Replaced by', 'Date of appointment', 'Position in table']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Mons', 'Philippe Saint-Jean', 'Resigned', '21 August 2008', 'Thierry Pister (caretaker)', '21 August 2008', '18th']
SQL:

assistant: SELECT "Date of appointment" FROM "Table" WHERE "Date of vacancy" = '4 December 2008';