@Monique898 Your listing is clearly for a maximum of two guests, so I am assuming that you will need to provide air bed, linens, pillows, bedding and towels etc for a third guest. If you do not already have an extra guest fee then I would negotiate an extra person fee with the guest taking into account any extra expenditure.. however, bear in mind that this is likely to happen again so the extra fee will need to be proportionate. Add this extra fee to your listing for additional guests and ask your guest to amend their booking by adding the additional person.