Investment Banking Summer Analyst

I was scheduled for an on-campus interview through my University's career site. The interview was 2-on-1 with an analyst and associate. I didn't have much relevant experience and they asked about an IB case comp on my resume that I couldn't talk much about because it was the first time I tried anything in IB. I think this is what tipped them off into thinking I had no idea what I was doing. Both didn't show much interest throughout rest of interview. Asked me 3 ways to value a company which I answered then just simply said "walk me through them all" like I was really going to just talk for that long. Eventually cut me off through DCF to ask more a question in more detail.