When Chinese people exchange greetings, they often address others by using their family name with title, like Li Jing Li (Manager Li). They show their respects to other people in this way. In the daily life, Chinese people generally call each other by full names, like Wang Hong (Wang is last name, Hong is first name). Only among good friends or family member, Chinese people will call each other by their first name, like Jianli (Jianli is first name, no last name here). If your Chinese friends, colleague or business partners call you just by your first name, maybe they think you are their good friend.