user: Question: When Dietrich Fischer-Dieskau is the olivier who is the conductor?
Columns: ['Year', 'Conductor', 'Opera House or Orchestra', 'Label', 'Countess', 'Count', 'Flamand', 'Olivier', 'La Roche', 'Clairon']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1953', 'Clemens Krauss', 'Bavarian Radio Symphony Orchestra', 'Walhall Eternity Series', 'Viorica Ursuleac', 'Karl Schmitt-Walter', 'Rudolf Schock', 'Hans Braun', 'Hans Hotter', 'Hertha Töpper']
SQL:

assistant: SELECT "Conductor" FROM "Table" WHERE "Olivier" = 'Dietrich Fischer-Dieskau';