change tune(или отношение к чему-либо; He was against the idea to start with, but he soon changed his tune when I told him how much money he'd get out of it. Val_Ships)
call an audible(to change one's decision or course of action in response to changing or previously unforeseen factors: I planned to take that route, but there's too much traffic now. I think I have to call an audible and take the highway insteadTaras)