I have had the opportunity to answer some "floor calls" in the last week and every one of them has their home on the market, and they are calling me about a property they are interested in. We chat for about 5 minutes before they tell me that they have their home on the market and then I ask them the question. "Is an agent representing you on selling your home?" Answer is Yes. Then I ask, "Do you want them to represent you when you purchase a new home?" Answer is YES. So I tell them, well you need to contact your agent as I may be in breach of a contract you have in place with your agent. They say, "you mean, they can show me a house?" Oh my goodness, I almost fall off of my chair when I hear this.
So my advice is, if you want to represent your clients on both sides of their purchase and sale, Teach them about how we work as agents. Instruct them to email you or call you with questions. You could potentially lose the other side if you don't. Other agents out there may not be so willing to just give up on the client and they may convert them over without you even knowing it.