Communicating is Art and Science
Whether we sell, serve our clients, educate, motivate - in business we always communicate. We ask, we listen, we suggest solutions. Therefore, understanding communication is essential for everyone doing business.
Here is a small diagramm showing the nine stages of a professional conversation. It relates directly to customer service, you can use it there as is. And it will work with small adaptions also for sales conversations

You are welcome to share this image as you please.