The traveller is entitled to claim compensation of the damage
1. they suffer due to technical defects in the booking system of the organiser, the retailer, the facilitator of linked travel arrangements or the service provider unless the trader respectively concerned is not responsible for the technical defect,
2. that one of the traders set out in no. 1 has caused by an error in the course of the booking process, unless the traveller is at fault for the defect or it was caused by unavoidable extraordinary circumstances.