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The body language is very important when dealing with customers.
So, simile and voice inflection are very important tools.
see smiling means you are inviting someone and making a face like a drakula is you know what i mean...it is a most important non verbal communication. you may lighten up the environment with your radiant smile. smile reflects openness and friendliness enabling you to strike a chord and create a deep relationship with their client.
its your expressions with face and body.