Optimizing their appointment system which manages customers and appointments for all Leroy Merlin stores in Italy. The process of creating an appointment or finding an available date was taking too much time to be computed. For this thing we had to also take care of was whether customer wanted to change their appointment and finding another day or time slot. The old system worked by selecting a date range and checking all available time slots in each day. So, if the date range was too long, it was slower, if it was short, it was faster. To avoid this, we offered another solution which is not dependent on date range.