Are tips common?

I got laid off last year and just started driving today to make ends meet. I only got 4 trips in, but of the 4, one person left a tip.

I did my best to keep things professional and let the riders dictate the quantity and flow of conversation, the car was clean, and I was as well.

I’ll drive more tomorrow, but I’m wondering if today was a fluke or if it’s pretty normal.