message before Reboot step, how to add a cancel button to the pop-up users see?

We have a package that consists of 9 steps, on the 7th step a reboot is required. In step 6 A pop-up shows up for the user saying that in 3 minutes the computer will restart if they take no action, or to click ok to restart immediatly. 

Is there a way I can also add a cancel button to this pop-up so the user can cancel the installation if it's a bad time? Possibly with a powershell command? 

Thanks in advance! 



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