My standard answer to this, assuming I am starting out with a normal job-posting's worth of information, is "I don't know that I do want to work at X yet. That's one of the things I hope to figure out in this process." Said nicely, of course.
People forget that an interview is a dialog between two parties. As a candidate I am not trying to "win" by getting an offer; I am trying to find out if this is a place I actually want to work.
People forget that an interview is a dialog between two parties. As a candidate I am not trying to "win" by getting an offer; I am trying to find out if this is a place I actually want to work.