Why Does Conflict Originate?

Why does conflict originate

I wonder why they’re really upset?That’s John’s fault again – wait ’till I see him!!!
How would I feel if this happened to me?Why is this person shouting so loud at me?
Is there a potential solution to this?And how’s that my fault?
What do you think they want to happen?This is the fourth angry customer I’ve had to deal with in a row!