When you have an appointment for a job interview and you can't make it, what should you do? The answer depends on whether you have decided you don't want the job and want to cancel completely or if you want to reschedule for another date and time.
When You Want to Cancel
If you have decided that you're not interested in the postion after all and you don't want to go to the interview, it's common courtesy to let the interviewer know that you have withdrawn your candidacy for the position.
Call or email the person who scheduled the interview to let them know that you are not going to make it. Provide as much notice as possible. There's no need to give a reason or an explanation.
There are a couple of reasons why it's important to let the interviewer know you won't make it. First of all, it's good manners. Secondly, if you simply don't show up or give very short notice, you are burning your bridges with the company and won't have any chance of getting hired by them in the future.
When You Want to Reschedule the Interview
The best way to reschedule a job interview is to email and call the person who scheduled the interview. Suggest an alternative date so you can secure another interview slot.
Give Plenty of Notice
Either way, give the company as much notice as possible that you aren't going to show up for the interview. Being considerate of the interviewer's time will be appreciated, even if you don't want the job.