How do you solve if the guest lost his money?

If a guest reports lost money, first remain calm and empathetic, assuring them you will assist. Ask for details about when and where they last had the money, and check common areas like the front desk or lost and found. If the money is not found, document the incident and consider involving security or local authorities if necessary. Finally, remind the guest about safety measures and encourage them to keep valuables secure in the future.