Reading of the passage
New Practical English I
After making an appointment, generally, don't change it as that is impolite. If you do have to change it, you should inform the person by telephone or with a written note as soon as possible, so that he or she can make a rearrangement. Sometimes, an appointment has already been made, but something unexpected happens and you find no time to inform the person concerned. In this case, you should make an apology to the person afterwards.
Unit 4