I doubt someone would just not show up. I had a TY interview that I had to cancel because of availability issues. I scheduled it in early october, then in mid oct I asked to change my mid Nov appt, the RC told me they couldnt so I decided to cancel it. I sent an email and a phone call, then on the day of the interview I get a call about me not showing up. I call back and I tell them I sent an email on Date X and got a reply on Date Y acknowledging this.
She looked through her records and apologized. In reality everyone is adding, cancelling and going through a lot of interviews. Some people are just more organized then others. I really doubt someone in their 4th yr of med school is that unprofessional but then again oh the things I have seen from some residents 😱 (non EM BTW)