my GET route not working in laravel

I am new to laravel and working on a form.

This is the form

<form action="/product" method="GET">
<div class="input-group">
  <input type="text" class="form-control" placeholder="Enter product name" />
  <div class="input-group-btn">
    <input type="submit" class="btn btn-danger" value="Search" />
  </div>
</div>

And this is the Route I have written

Route::get('/product/{product}', 'FlashCartController@find_product');

When I submit my form it says

NotFoundHttpException in RouteCollection.php line 161:

How do I submit this form?

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