SAIC Intern interview questions

The hiring manager forwarded my resume to the hr. And the hr called me up on a Friday morning. She asked several basic questions about my working permits, my relevant education background. Two behavioral questions but no technical questions at all. A follow up phone call from hiring manager was on next Tuesday (quite efficient by the way). We didn't chat a lot before we get to the interview. He asked me to describe relevant experience I listed on my resume and particularly asked me what my role was in those task. Overall it's a nice experience, but I don't know why I didn't get an offer.