public void fetchPassengers(final PassengersActivity activity, String token, final
    NewPassengerManageRequest.Passengers passengers) {

        EspressoIdlingResource.increment();

        backendClient.fetchPassengers(
                BackendConstants.CONTEXT,
                token,
                "-1",
                requestBody,
                new Callback<GetPassengerData>() {
                    @Override
                    public void success(GetPassengerData getUserData, Response response) {
                        Utility.LogResponse(response, request);
                        EspressoIdlingResource.decrement();
                    }

                    @Override
                    public void failure(RetrofitError error) {

                        Utility.LogResponse(error.getResponse(), request);
                                        });
    }
            });
}