How to Reset Data in Ajax Autocomplete textBox

$('#txtAfgModelGrpName').autocomplete({
                    source: function (request, response) {
                        $.ajax({
                            url: v_url,
                            data: "{ 'Name': '" + request.term + "' }",
                            dataType: "json",
                            type: "POST",
                            contentType: "application/json; charset=utf-8",
                            dataFilter: function (data) { return data; },
                            success: function (data) {
                                if (data == null || data.length == 0 || data.d == null) {
                                    data = "";
                                    data.d = "";
                                }
                                else {
                                    response($.map(data.d, function (item) {
                                        return {
                                            value: item.GrpName,
                                            id: item
                                        }
                                    }))
                                }
                            },
                            error: function (err) {

                                alert(err);
                            }
                        });
                    },
                    minLength: 3,
                    select: function (event, ui) {
                      
                        LoadData(ui.item.id.GrpSeq);
                        return true;
                    },
                    change: function (event, ui) {
                        debugger
                      

                    }

                })
      .focus(function () {
          if (this.value == "") {
              $(this).trigger('keydown.autocomplete');
          }
      });