If there is bad weather at the time, ask the family to prepare a change of clothing to bring with them (underwear, socks, coat and shoes) because their clothing could be wet or soiled.
Approach the person living with dementia in a casual manner and make sure they see you coming. If the person does not wish to return home immediately, walk a short distance with them while speaking in calm, normal, tone of voice.
Reassure the person about where they are and why. Let them know they are now home and others will be happy to see them.
The experience of someone going missing can be very stressful. Remember that the behaviour is part of the dementia and that no one is to blame.