Solution

form.php

<form method="POST" action="http://frontline.dev/appointments/4" accept-charset="UTF-8">
    <input name="_method" type="hidden" value="PATCH">
    <input name="_token" type="hidden" value="PROPCMA5b4UC4SNexoexu2ANst1a1OLo7bjJTYzk">                        
    <input name="appointment_time" type="hidden" value="2014-02-20 13:00:00">                        
    <input name="status" type="hidden" value="ARRIVED">
    <div class="btn-group actions">
        <a class="status-btn btn   " data-action="confirm">Confirmed</a>
        <a class="status-btn btn    btn-info     " data-action="arrived">Arrived</a>
        <a class="status-btn btn   " data-action="complete">Completed</a>
        <a class="status-btn btn   " data-action="canceled">Cancel / refund</a>
        <a class="status-btn btn   " data-action="canceled">reschedule /schedule</a>
    </div>
    <input class="btn btn-info" type="submit" value="Update">                    
</form>

script.js

 var obj;

    $('form > input').each(function(k,v){
      if(typeof(obj) == 'undefined'){
       obj = {};
      }

      obj[v.name] = v.value;

    });

    $('.status-btn').on('click', function(){
        obj.status = $(this).data('action');
        console.log(update());

    });

    function update(){
      return $.ajax({
        url: $('form').attr('action'),
        type: obj._method,
        data: obj,
        success: function (data) {
          return data
        }
      });
    }