The Law of Reciprocity is a social rule that describes the phenomenon that when someone does something nice for you, you feel psychologically compelled to do something nice in return. When you offer something of value to the agent, the chance of the agent saying yes to you is more likely.
I’d like to give you [a book/market report/invite you to a class] for your work as a co-op agent on that transaction. Let’s meet for coffee so we can talk more about it. I’d like to hear more about your business and the challenges you are facing.