Can't create Macintosh HD partition - greyed out

I was erasing the data on a mid 2012 MacBook Air before giving it away and I think I deleted the Macintosh HD partition (The second one from the top in disk utility that is indented over.)
Once this happened I lost the OS X and was not able to get past OS X Utilities when turning it on.
I tried doing the Reinstall OS X but my entire hard drive (128gb) was not there to select, only the recovery HD (approximately 600mb.)
I was able to download OS X onto a flash drive and that lets me get into the MacBook, however I still cannot access the hard drive.
When I go back into Disk Utility the option to create a partition and access the entire 120gb is greyed out.
I don't care about saving/recovering any information, I just want it back to normal.
If anyone can help me out it would be greatly appreciated, thank you!

Do this:
Install OS X Using Internet Recovery
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Internet Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND-OPTION- R keys until a globe appears on the screen. Wait patiently - 15-20 minutes - until the Recovery main menu appears.
Partition and Format the hard drive:
Select Disk Utility from the main menu and click on the Continue button.
After DU loads select your newly installed hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed. Quit DU and return to the main menu.
Reinstall OS X: Select Reinstall OS X and click on the Install button. Be sure to select the correct drive to use if you have more than one.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.
This should restore the version of OS X originally pre-installed on the computer.

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