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If you talking to a customer,and then their feet start to point at the doors,that usually signals they want to leave,
We can look for by learning about it,but we do it without thinking already,we meet somebody,their body language,their voice tone,arguably had more of an effect on what you think of them than what they actually said,because you have to control the other person,so they don’t like find the secret,

Observe the customer's body language and facial expressions, listen more to the customer's needs, and grasp the customer's psychology.