Migration Assistant deleted all files

Hello,

I bought new Mac book Air and during the first attempt to transfer files from old Mac to new one, a new User was created and files were transfered succsessfully. I had one User in old mac and new User in new Mac.

During the second attempt to transfer files only from Desktop (about 70 GB of information - pictures and files), migration stucked in the midle, so I ended it (turned off). After that, when I opened my old Mac, all the Desktop and old user was gone, everything is deleted.

Maybe you can tell me whats happened? Did everything is deleted?