I'm not sure. It's not a regular (black or red) rat snake or regular corn snake but both of those species come in a variety of colors and sometimes patterns. It does have the black squares of the two rattlesnakes that are in NY but if the person didn't hear/see a rattle, it's not that.
I'm not very good with identifying snakes. Here are some sites:
http://www.esf.edu/PUBPROG/brochure/snakes/snakes.htmhttp://www.wnyherp.org/field-guide/reptile/snakes/While looking at photos, I found this funny one of a rat snake:
http://www.worth1000.com/entries/48000/48024NtVS_w.jpg