LONDON (Reuters) -British software company Sage said its small business customers have cash but are reluctant to spend it because of uncertainty linked to U.S. tariffs, although it on Thursday stuck to its full-year growth forecast. Chief Executive Steve Hare, however, said the volatile economic environment was making the group's millions of small and medium enterprise customers cautious. Shares in Sage fell 5% in early deals, wiping out the gains they had made this month.