Hello, here is the problem. You must go to this link and make a simulation of booking a dog training session: https://olykan.fr/cours-education-canine-paris/#cours

When a person decides to book a set of sessions, they must choose a dog trainer. Once she has validated the schedules, she is redirected to a page which summarizes the appointments she has chosen (date + time + dog trainer).

But if this person decides to click on the “cancel” button, they will be redirected back to the calendar to reschedule appointments. She will also have the possibility of changing dog trainers during class, which creates a big problem... I'll give you an example:

If a person decides to choose January 23 with Mégane, validates the date, then clicks on "cancel" and returns to the calendar, and if they finally decide to change dog trainer, for example take Nathan, and decides to take other dates with Nathan. If Mégane is available on January 23 but Nathan is not available on January 23, then on the page which summarizes the appointments, we will see that this customer will deal with two dog trainers, that is to say that He will have lessons with Mégane on January 23 and lessons with Nathan for the other chosen dates.

But we don't want a person to have the option of having two different dog trainers for the same course.

We therefore need to know how we can block the fact of having several dog trainers or, otherwise, ensure that when a person clicks on the "cancel" button (on the page which summarizes the appointment you), the agenda completely resets, as well as the choice of the dog trainer.

Did you understand my problem? How can I do ?

Thanks in advance.