Loading View with Posting Data

So I have a view called select_dates.php and it takes in POST data (start date, end date, and product ID). Once you press submit

$this->load->private_view('reports/edit', $data);

which will load a view that has the report based on the POST data given. However this view(reports/edit) also has a form at the top which can ask for these same 3 POST data in select_dates.php. However once I press submit here the data isn't getting posted at all. Any thoughts or ideas?