Everyone has their own style, but it's worth thinking about how dialogue works more generally and how we can write it better for individual characters. Two things to mention here without going over what I wrote about dialogue here:
Length
Sometimes I read scripts in which one character talks and talks and talks. A character walks in and tells you what they did that day - and the other characters stand around listening. And then another character talks and talks and talks. Our lives are conversations. We say a sentence or two, and then someone else talks for a little bit. The conversation goes round the room, being filtered and remixed by the various characters and perspectives in the room. That's when it starts getting interesting.
This is the kind of dialogue I'm talking about. It's not uncommon to read this kind of mildly predictable and slightly stererotypical/sexist scene (which I've just made up as I've typed it. It's not real dialogue from something I'm working on.)
INT. KITCHEN. DAY.
MAVIS IS COOKING AT THE HOB, STIRRING A SPOON IN A SAUCEPAN
MAVIS
So, how was your day, Steve?
STEVE SLUMPS INTO A CHAIR.
STEVE
You don't wanna know. It was a nightmare. A total and utter nightmare. The buses were slow - as they always are on our road. The tube was down. Well not down. But stop start all the way into work. And when I got in Wendy was off sick. As usual. That's the fourth day out of the last eight working days. Honestly, the rest of us struggle into work. Why can't she? Then the big meeting started. The Boss droned on and on. Something about targets and marketing. Wasn't really listening because I was thinking about my next meeting when I knew that I was going to be bollocked for the St Albans incident.
Okay. It's not very funny, is it? But hey, most scripts (including mine) aren't very funny. But reading it, it doesn't ring true. He's not having a conversation. He's just talking. And talking. And talking. SHUT UP, STEVE! I now do not care about your life, Steve. You're not a real person, Steve.
So, let's break it up to make it at least mildly humourous and believable. Then we might care. At the very least, how about something like this:
INT. KITCHEN. DAY.
MAVIS IS COOKING AT THE HOB, STIRRING A SPOON IN A SAUCEPAN
MAVIS
So, how was your day, Steve?
STEVE SLUMPS INTO A CHAIR.
STEVE
You don't wanna know.
MAVIS
You're right. What's on TV tonight?
STEVE
(ignoring her) Nightmare. The buses didn't move. The tube was stop-start. And when I did get in, guess what?
MAVIS
They gave you a hand-gun and licence to kill?
STEVE
If only. Wendy.
MAVIS
Off sick? Again?
STEVE
Thank you! The fourth day out of the last eight working days.
MAVIS
But who's counting. Oh hang on. You.
STEVE
(sarcastic smile) The rest of us struggle into work.
MAVIS
Passing round your germs. She should be more considerate and come in.
STEVE
Anyway, the big meeting started. The Boss droned on and on. Something about targets and marketing. Wasn't really listening because I was thinking about my next meeting when I knew that I was going to be bollocked for...
MAVIS
Not paying attention in meetings?
STEVE
... the St Albans incident.
MAVIS
Ah yes. Well, that's in the hands of the police now, isn't it?
Okay, it's nothing special and all very smart-arse, but you get the idea. Get your characters talking to each other. Like they do in real life.
It's All Lies
The other thing to bear in mind, however, is that people frequently don't say what they mean. Quite often say the opposite, or filter it - often because of the opinion of the person standing in front of them. They lie. They delude themselves. The things they say are for their own ears, to reinforce the lies that they're trying to drum into their heads, or block out the noise of the stark reality around them.
How could that scene go with the addition of standard lying and self-delusion? Something like:
INT. KITCHEN. DAY.
MAVIS IS COOKING AT THE HOB, STIRRING A SPOON IN A SAUCEPAN
MAVIS
So, how was your day, Steve?
STEVE SLUMPS INTO A CHAIR.
STEVE
Fine. Great. Perfect.
MAVIS
Good. What's on TV tonight?
STEVE
(ignoring her) The buses didn't move. The tube was stop-start. And when I did get in, guess what?
MAVIS
They gave you a hand-gun and licence to kill?
STEVE
If only. Wendy.
MAVIS
Off sick? Again?
STEVE
I know. She's got some medical condition. It's sad. Really sad. And she's good. When she's actually around.
MAVIS
Ooh, you hate her.
STEVE
I do not. I don't hate anyone. It's just she's, you know, not been around much recently. And I just think missing four days of the last eight working days should require a doctor's note or something.
MAVIS
Could she bring in a blood sample, maybe, to be independently monitored?
STEVE
(sarcastic smile) The rest of us struggle into work.
MAVIS
Passing round your germs. She should be more considerate and come in.
STEVE
Anyway, the big meeting started. The Boss give his speech about targets and marketing strategy...
MAVIS
You have no idea what he said do you?
STEVE
I was distracted by thinking about my next meeting when I knew that I was going to be bollocked for...
MAVIS
Not paying attention in meetings?
STEVE
No. The St Albans incident.
MAVIS
Ah yes. Well, that's in the hands of the police now, isn't it?
From this we learn that Steve isn't as nice as he'd like to think he is. And no as good as his job as he's like to think he is. And that Mavis realises this. Now where getting somewhere.