Kix

I am using Kixtart on a Windows 2000 Platform to deploy software. I am trying to do a reboot after a particular software installation. However, I would like a box to appear on the screen asking the user “Would you like to reboot now or later”. If they select now, the PC will reboot, if they select later, the user can reboot later by them selves. How can I put this in my Kixtart script. What command do I need to use. I would be most grateful if you could give me the correct syntax in order to achieve this.