ArcSight Software Engineer interview questions

I went to the job fair and had a screening interview. After about a week later they call me for on site interview. I arrived about 10 minutes before the interview. I walked in the building and sign in with front desk receptionist and was told my interview will be in 15 minutes. About 20 or 25 minutes later one of their manager came and told me that the interview is cancelled for that day but someone will contact me shortly to reschedule the interview. I said ok and went back home. Days later I called the contact person I had from email and was told they don't want to continue the interview process with me. There is no reason given.