Listen to their concerns, what they want. The client, who is also another human being, just like you will tell you all you need to know. Ask questions, show the massive value you can bring to them, talk about future contacts you will have and how you will service them moving forward. In other words, tell a story they can see in their minds. People love to buy, they hate to be sold. Everyone will find a way to pay for one thing, value. Learn their why, earn their trust, see them buy.