To start with, many sales managers will say to their salesperson, "good job on the...account." If a sales managers really wants the words to resonate with a salesperson, get specific about what 'good' looks like. For example, "I appreciate your ability to read the customer so well. I noticed that you really have a knack for getting the internal team to support your cause. I know you always operate from a place of integrity." When you are specific, salespeople realize you are watching and paying attention.