user: Question: How many tickets were available at Halle Tony Garnier on June 15, 2009?
Columns: ['Date', 'City', 'Country', 'Venue', 'Tickets available since', 'Attendance', 'Comment']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['May 2, 2009', 'Nice', 'France', 'Palais Nikaia', 'May 23, 2008', 9000.0, 'Sold out']
SQL:

assistant: SELECT "Tickets available since" FROM "Table" WHERE "Venue" = 'Halle Tony Garnier' AND "Date" = 'June 15, 2009';