user: Question: Please mention those appointment dates those are replaced by Alfredo Aglietti
Columns: ['Team', 'Outgoing manager', 'Manner of departure', 'Date of vacancy', 'Replaced by', 'Date of appointment']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Ascoli', 'Giuseppe Pillon', 'End of contract', '1 Cannot handle non-empty timestamp argument! 2010', 'Elio Gustinetti', '1 Cannot handle non-empty timestamp argument! 2010']
SQL:

assistant: SELECT "Date of appointment" FROM "Table" WHERE "Replaced by" = 'Alfredo Aglietti';