Of course...….you should show them the way to work out their issues and get pre-approved in the future.  Meet with them and one of your mortgage originator affiliates to show them how to do it.  Keep in touch with them on a regular basis to let them know you haven't forgotten about them, as well as to see if they have any further questions.  They eventually will be able to buy...….and, they will buy with you if you help them!