Why did this random interaction happen at the mall?

I like to just walk around the mall sometimes,

Today I was walking alone and there was a group of 3 or 4 teenagers walking in front of me.

Completely out of nowhere one of them looked back at me and he this interaction happened.

Him
“Can I say something?

Me
“Yeah what’s up”

Him.
“I just wanted to say I hope you have a good day”

Me.
“Thanks I appreciate it.”

(I should have said “thanks I appreciate it, I hope you and your friends do as well” but I didn’t think of that at the time)

Then he turned around and one of his friends asked what he said to me and he told them.

Then I decided to turn around and leave the mall which I was planning to leave soon anyway.

This was very wholesome but random.
He didn’t seem to be messing with what.

What do you think this was about?
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Why did this random interaction happen at the mall?
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