reinstall OS Yosemite

I mistakenly deleted a disk while trying to "wipe" my Macbook Air. I am in recovery mode trying to reinstall Yosemite. When I get to that point it asks me to select the disk where I want to install the OS. The problem is that no disks are listed so I cannot continue with the installation. The only option I have is to go back. What do I do? Disk Utility?