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A major part of diplomacy is helping others feel comfortable with you.  Instead of jumping right into a serious talk, establish a level of friendliness with others.  Talk about each other's weekends, spouses, kids or hobbies.  Discuss the latest news or TV shows that you’re watching.  Help them feel at ease by showing your interest in their lives. Inject humor where you can. Show empathy for them by mimicking their gestures and posture.  If they are sitting with their hand resting under their chin, do the same.  This shows that you are engaged in the conversation. Smile at them when you see them at first, as well. People often respond positively to the use of their own name.   Every so often, use their name while you’re talking. It can be something simple like “Where would you like to have lunch, Kyle?” or something more serious like “Andrea, I’m so sorry to hear about your mother.” When having a talk with someone, avoid using your phone or daydreaming.  Instead, actively listen to them so that you can understand their perspective.  Relay back what they said to you to prove that you hear them. For instance, you might say “It sounds like having to take care of your mother and your small child is really taking a toll on your health.” Show that you’re listening to them by learning more about what they’re discussing.  Ask them open-ended questions that require thought and more than a ‘yes’ or ‘no’ answer. Ask something like “Wow, you went to Greece?  What made you decide to go there and what did you like best?”
Make small talk to create comfort. Mirror their body language. Use their name in conversation. Be an attentive listener. Ask them questions.