user: Question: Tell me the lowest date commissioned for iron rmsrhone and gross tonnage less than 2738
Columns: ['Ship', 'Date Commissioned', 'Gross Tonnage', 'Propulsion', 'Material']
Types: ['text', 'real', 'real', 'text', 'text']
Sample row: ['Actaeon', 1842.0, 650.0, 'Paddle', 'Wood']
SQL:

assistant: SELECT MIN("Date Commissioned") FROM "Table" WHERE "Material" = 'iron' AND "Ship" = 'rmsrhone' AND "Gross Tonnage" < 2738.0;