I cant create a new hard disk partitition

I cant create a new hard disk partitition from disk utility. I bought new macbook pro retina 15 inch mid 2014 but when i go to disk utility and try to create a new partition it shows that i just have free space of 2 gb from my core maconotish hd and there another one maconotish which have all free space I dont know what to do any solution please