Sam considers the offer. He hadn't exactly eaten or found food yet--but he didn't want to necessarily come across as desperate or incapable of finding resources of his own. Still, they're all new to this environment, so it's not like the guy is going to be able to offer him much. Sam can always find a way to return the favor later.

"I'm not starving yet, but I also realize the situation...so if you're offering a little food I wouldn't say no."