user: Question: What's the constituency number of the Seoni district and has None reserved?
Columns: ['Constituency number', 'Name', 'Reserved for ( SC / ST /None)', 'District', 'Number of electorates (2009)']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['108', 'Baihar', 'ST', 'Balaghat', 163201.0]
SQL:

assistant: SELECT "Constituency number" FROM "Table" WHERE "Reserved for ( SC / ST /None)" = 'None' AND "District" = 'Seoni';