How to create a list that my Discord bot can use as a trigger?

Good evening, I need help with configuring my Discord bot.
I have already created the bot and connected it to my Discord server.
Now I am faced with the question of how to program the bot, or the correct trigger.
I want my bot to create a list of users when they respond to my post with a certain emoji.

Example:
Post: Event
Emoji: Emoji1, Emoji2, Emoji3

Emoji1 Emoji2
Chris Gina
Dana Ronald

Would be great if you could give me a step by step explanation for this as I am completely inexperienced.