Yes this is false. If you are not confident you are more likely to make decisions based off what others think
You would want to talk to her in the back and use a moderate tone and show her the schedule showing that she was booked for a appointment another day and time. You then tell her that you are sorry for any inconvenience and that you will be expecting her on the right day of her appointment.
I am stuck on this question as well. Did you get the answer?