How do I do make a nice relation with the public ?

By good communication skills great relation can be made

Is all start how you represent your self, the way you approach them in a friendly manner, body language, the clothing you wear, how professional your are, just as can you see a doctor in hospital looking with a clown suit with his patient, appearance always is the first impression they got from you, is got the same way with answering the phone as receptionist. Find something in common with the customer, as language, color, clothing, make them fell comfortable as they approach you, as shaking hand, my name is:       , and your are,            , offer something as coffee or a drink, and find what they are looking for, or what the reason they here, i'm at your service, how can I help you, Sir, Mme,. offer a chair to sit down, and the rest will be very easy, 

By treating them respectively  

Speaks to humans tactless manner with the public and style speak good way