“再确认”用英语怎么说？

请于出发之前再确认一下.Please reconfirm before you leave.我要再确认一下我从伦敦到东京的班机.I'd like to reconfirm my flight from London to Tokyo.我们必须从英国取得无歧异的再确认.We must secure from the British unequivocal reaffirmation....