Your snake is either a Cinnamon or a Pewter

A cinnamon is a single gene animal, a pewter is a two genes animal (Cinny and Pastel), now pewter can also be made with Black Pastel as well (Black Pewter)

Some people will refer to their pewter as Cinny Pewter just to point out that it was made with a Cinny and not a Black Pastel.

Without a picture I can't tell you what you have.