Making id not incrementing during loop

I have this form in the view:

Your Name: <input type="name" name="name" id="name" ><br><br>
Your Contact No. <input type="contact" name="contact" id="contact" ><br><br>
Todays date:<mark></mark><br><br>
<br><br>BOOK SEATS:<br>
@foreach($seats as $seat)
@if($seat->available=='1')
<input type="checkbox" name="check[]" value="" ><br><br>
 @else
<input type="checkbox" name="check[]" value="" disabled><br><BR>
@endif
@endforeach
<button type="submit" class="btn btn-default">Book</button>
</form>

this form redirects to this controller which inserts the name contact and the value of checkbox checked with loop. This way, if i check two values and submit the form, due to for loop two rows will be inserted with same name contact but with different booked_seats and id(i used id as auto increment). Is there any way of inserting the checked values into booked_seats with only one row. OR making the id same for any rows inserted(checked values) at the time.

 public function book(Request $request)
  {
    $name=$request->get('name');
    $contact=$request->get('contact');
    $check=$request->get('check');
    $totalcheckboxchecked=sizeof('$check'); 
for($i=0;$i<=$totalcheckboxchecked;$i++)
{
    if (array_key_exists($i,$check) )
{   
    $booked=$check[$i];
    $book=bus::insert(['name'=>$name,'contact'=>$contact, 'booked_seats'=>$booked, 'active'=>'1']);
    seats::where('book',$booked)->update(['available'=>'0']);

}
}
        return redirect('/bus')
            ->with('message','booked successfully!!!');

}

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