user: Question: What manner of departure is listed with an appointment date of 13 March 2008
Columns: ['Team', 'Outgoing manager', 'Manner of departure', 'Date of vacancy', 'Replaced by', 'Date of appointment']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Stenhousemuir', 'Campbell Money', 'Resigned', '29 September 2007', 'John Coughlin', '12 October 2007']
SQL:

assistant: SELECT "Manner of departure" FROM "Table" WHERE "Date of appointment" = '13 March 2008';