I was invited for a HR interview. They made me wai...

I was invited for a HR interview. They made me wait for an hour. After the CEO took my interview I was waiting for the HR discussion. One random employee walks to me saying the HR is not in office, while I had just seen her on floor. Then the employee says she must have left as the office time is over. Why do such companies waste candidate's time? I went for the interview leaving early from my current company. Finally the HR arrives and asks me my expected salary in front front desk executive. Is this professional? Horrible experience!!