When the interviewer takes steps to conclude the interview by thanking you for your time or asking whether you have any additional questions, respond with, I am very interested in the position and I would like to know about the next steps in the hiring process. Could we set up a time to meet in person?

Even if your interviewer does not seem particularly enthusiastic during the interview, you should still ask HR reps in particular are trained to give as little indication of interest as possible, to test your perseverance and to avoid raising any candidate's hopes prematurely. If your interviewer declines your offer to set up an interview on the spot, ask when you should follow up.

Finally, enthusiastically thank your interviewer again for taking the time to call. Your graciousness, appreciation and interest will leave a positive impression.