user: Question: When was outgoing manager Zoltán Varga appointed?
Columns: ['Team', 'Outgoing manager', 'Manner of departure', 'Date of vacancy', 'Position in table', 'Replaced by', 'Date of appointment']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Haladás', 'László Dajka', 'Sacked', '17 September 1998', '16th', 'István Mihalecz', '17 September 1998']
SQL:

assistant: SELECT "Date of appointment" FROM "Table" WHERE "Outgoing manager" = 'Zoltán Varga';