Kanye West has a line in one of his songs to the effect of "My presence is a present". Despite the cocky context in which this line was delivered (and, in all honesty, the one who delivered it), there seems to be an underlying reality-that our presence is one of the most important things we can offer another person. The basis of this is not so much that we are special in and of ourselves. It is rooted in the dignity of being human.
Whether or not one believes in a higher power, nature saw fit for each person on this Earth to be born, grow, and commune with others. Yet, as St. Teresa of Avila said, "All things are passing". That includes us as well. Given our limited time on this planet, being present to someone acknowledges their existence as a fellow human. It shows that it's not all about you, that others are just as deserving of time and attention. As, in the words of Thundercat, "seasons will change and black hair turns gray", our presence is the very least we can offer someone else. At the end of the day, it's all we really have.