Our payments modernization project was scoped at 120 story points, with two-week sprints and a velocity of 20, so six sprints to go-live. By the end of sprint 2, the business has added five change requests totaling 30 points, and they say the go-live date can't move. How do you have that conversation?

支付系统改造项目定了 120 个故事点，团队每两周一个 sprint、速度 20 点，计划 6 个 sprint 上线。第 2 个 sprint 结束时，业务方陆续提了 5 个变更，一共加了 30 点，还说上线日期不能动。你怎么跟他们谈？