应用: 飞猪
任务: 打开飞猪，去购物车，找到“北京环球度假区”门票，修改数量为2
操作步骤:
step_id: 0
action: CLICK
step_id: 1
action: CLICK
step_id: 2
action: CLICK
step_id: 3
action: STOP