I think Maz's speach indicates its not parents that left her, just one of the parents.
This is highlighted further in the book, as during Rey's flashback she hears a voice she recognizes (its stated as 'that voice'). The two spoken sentences by that person are as follows.
"Stay here, I'll come back for you" and "I'll come back, sweetheart, I promise"
So it indicates that just one person left her and its most likely a parent. However, they had every intention of returning. So that pretty much rules out Han & Leia as they obviously didn't.
So I would guess it was Rey's mother that left her, however she died shortly afterwards. It wouldn't surprise me if the scene was missing from the film as the mother herself is going to be a reveal.
So for me its Luke as her father as there are just too many little hints. The lightsaber. The connection with the force. The Falcon, which Luke called junk and Rey called garbage. Then the most telling the final scene. Luke looking emotional in not only seeing his daughter but also finding out she is neck deep in it. Rey's reaction also shifts at the end towards a more 'you bastard, you abandoned me' look.
If I had to guess the mother, it would be Erso.