You have never met someone nowhere. You have met someone at a place. You have met someone at a time. The place needs x and y, if it's in the fields, in the desert, in the sea or any other 2 dimensional plane. But if there are buildings, you need the exact time, the 2 dimensional address, and the floor to shake hands with someone or to give a hug to someone and a present for their birthday.
That means we live in a 4 dimensional world.
But is that true?
Not completely true. If you meet someone at that right place in the right time, you've only found his and her body. For example, you can't meet with a dead body. You could only meet a person, if you are on time and if you are yourselves.
How many more dimensions takes to meet someone really?
Well, how many dimensions does it take to create a reality?
Only when you coexist with a person in the same full sense reality, not just the physical reality, you are going to meet with that person and do something together that makes sense.
Honestly expressing yourself in every time and place.
Unless you do that you'll not get the chance to meet someone who does the same, so that what you do makes sense.