YOU: You really upset me when you hadn't invited me for your party.
LUKE: My parents said that my birthday had been only for my family.
YOU: You should have told me that before.
LUKE: I'm sorry I hadn't apologised to you for not explaining it before. I didn't mean to upset you.
YOU: That's okay. I forgive you.
LUKE: Thank you very much. It won't happen again.
Dialogue is a written or spoken conversational exchange between two or more people.
(to) forgive - wybaczyć
again - ponownie/znowu
(to) apologise - przeprosić
(to) explain - wyjaśnić
(to) upset - zdenerwować