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Like Zeb says, listen to the dialogue you hear, on screen or in life. Don't necessarily fix on the exact words, although you should pay attention to that as well, but listen to the flow and the rhythm of it.
I've been told I write good dialogue, and sometimes yes, I do base it off what people really say. But it's more what people might say in a given situation and of course it depends on the characters you've written.
I try to think about my conversations with people, and how I've heard people talk. You have to smooth it out in writing -- no one wants to read a lot of um, uh, ah, or things like that. There's less stumbling in written dialogue, I think, but that's okay because it's written and you don't want the reader tripping over it.
Some general guides are to use contractions; don't use "SAT words" unless the character actually would; keep it fairly simple; don't be afraid to use fragments, as that's how people really do talk.
Dialogue is both the easiest and hardest part of writing fiction:Where do you find inspiration to write your dialogue? Do you base it on conversations you've engaged in?
Unless you are watching the SciFi channel That dialog would only serve as a bad example.
So I decided to check out PennLady's writing. She is indeed good at dialog. If you want to study how to do it, you could do a lot worse than reading her pretending series. Or, most likely, any of her stuff. I have only read the two Pretending chapters so far, but I plan on reading more.
(Also, if the dialogue doesn't convey some form of information--if only on the character--you should strongly consider pitching it.) Everything in the story should inform some element of the story.