You can use our template letter to do this. Airlines, however, generally do not accept any liability for inconvenience, stress or any consequential losses arising from the delay or loss of baggage, although if the flight was part of a package, you should put in a claim for this against the tour operator. But be warned: the compensation you receive is unlikely to cover the full cost of replacing the items, and you may be better off claiming on your travel insurance policy. It's a good idea to check your insurance policy first.