To reschedule a lesson, the teacher needs to go to the Calendar, select the desired lesson slot they wish to reschedule, click on it, and then press the 'Reschedule' button
In opened popup window teacher have to do following steps
Select who should initiate the rescheduling of the lesson: the teacher or the student. Afterward, choose the date to which the lesson should be rescheduled. Teachers will see days with available hours marked by a blue circle, indicating when they can reschedule the lesson.
Then select a time slot from selected day
And lastly write a reason for rescheduling a lesson
Then you teacher will see the rescheduled lesson slot from 15th June to 26th June, and 15th June will become available as an hour.