PhDHopeful115

Hi all, I got an interview request from a top b-school (top 5 ish) asking me to interview on Jan 29th. It is one of my top choices. I emailed the professor immediately but since then, have not heard a reply. The professor told me that he was traveling for a conference and would be busy last week but asked me to set up a few dates to interview. I sent a follow-up email on the 1st but I still have not received a reply. I do not want to bother him and I respect his schedule, but I am wondering when it would be appropriate to email him again (or if there is something else I can do). I do not want to miss out on this school. Thanks!