You will never be a people person if you are not truthful and deliver on what you say you will. People will start to avoid you when this happens. You need to make sure that if you promise something, you will do whatever it takes to make sure you get it done.
Of course, do not promise things if you feel you cannot get them done. You see this happen with companies all the time. They agree to anything customers ask for and then are unable to give them what they want. That is never a good situation to be in.
People will react negatively when this happens. The company will not get more business, and their reputation will be tarnished as a result.
Do not let this happen on a personal level. Be confident in knowing what people are asking you to do. Do not agree just because you do not want them to become upset with you. They will be more upset if you are not able to produce what you told them.
If you agree to meet with someone, be sure to keep the appointment. There are certain circumstances where you have to cancel, once in a while. That is okay, but do not make a habit of this. Being a people person means being dependable.
It is also okay to expect the same standards of others. If you find someone who is not dependable, you may have to cut ties with them. This may seem counterintuitive to the whole idea of being a people person, but it's not. You are expected to be reliable, and you should expect the same from everyone you deal with.
Of course, there are going to be occasions where people have to break appointments. This is normal and should be expected. Do not be too hard on people when it happens. But, here too, they should not be repeat offenders. It is important to be understanding, but there is a point where some people will take advantage of this.
When you are known as a person of your word, others will have no problem recommending you. In fact, they will start referring you even without you asking for it. This is one of the foundations of being a people person.
Being a people person is mostly about common sense. It's about interacting with others and having some expectations for everyone you deal with. It's about developing friendships as well as work relationships. As you increase the number of people, you will discover what works best for you and those people.