The file should first contain the contract, booking confirmation, description and information supplied at booking. Add invoices, payment records, change notices and the service description applicable at the time of booking. For dynamic websites, preserve the relevant version with a date or an unchanged export.
For the trip itself, create a chronology: arrival, first observation of the deviation, notice, response, remedy attempt, alternative service, further complaints and departure. Keep original photographs and videos together with the recording time and a short location note. For statements by staff or suppliers, record the name, function, time and substance.
Record the financial side separately. A price reduction concerns the lost value of a non-conforming travel service. Necessary expenses, such as the cost of an alternative service, should show their purpose, amount and proof of payment. Further loss and serious interference with the holiday must not be merged into the price reduction. The travel defect glossary entry explains the distinction between deviation, remedy and consequences.