Recently retired university professor; PhD in Land Surveying and Civil Engineering topics

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While it is true that there could be last minute schedule changes and emergencies, I look at a tutoring session like an agreement to go to lunch with a friend. If you can't make the meeting, you try to let your teacher know as soon as you see you cannot make the appointment. The first time this will be forgiven, but repeats of broken appointments will be charged for the time lost.