Be on time for your appointment with your instructor. Nothing irritates me more as an instructor than having a student not be on time thereby wasting my time.

From my perspective If I can take the time to prepare a spare airplane to fly just in case there something wrong with the students, pack the vehicle, drive 10 miles to the field to meet the agreed lesson time. I expect the student to do the same.

In fact I now have personal 15 minute rule about the student being late. I either will not instruct, or leave the field to do other things. The exception is if I get a phone call explaining that there is a problem and the student will be somewhat late.