A positive, strong relationship with clients based on mutual trust and respect is part and parcel of self-marketing and promotion for freelance business English teachers and trainers. Over a period of 2 decades, I have never had to chase any teaching jobs; clients have come to me based on personal recommendations.
When you do a good job in an excellent way, word gets out.
The workshop aimed to give participants an opportunity to consider the relationships they have with their clients - not their students - the people, organisation or institution with whom they contract to supply a service.
By simulating a meeting and practising how to present your best self, while a third person observes and gives feedback, you can test out ways of behaving in a safe environment. With the observer notes and feedback, you can formulate a plan of action for the next real situation.
These are the slides used in the workshop, with my notes from which you get a better idea of what the images refer to.