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Looking at the script of ellie chat in your game, you'd have to say exactly the right thing to trigger
anything in the game, even any response other than "IF YOU SAY SO". Not a trigger word but entire
sentence. The problem is that any of the trigger sentences can be said in several different ways, but only one of them works.
I'm sorry, but that way your game isn't going to work unless you do exactly what you did
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and give the player all the trigger commands in a list.
The kind of games that have this kind of option to freely chat with a character are usually built on keywords or combinations of two or maybe three keyword combinations, not entire sentences. It's a nice attempt to create something like that, but it will be near impossible to play without a complete walkthrough or at least a list of all possible commands.
I have no idea at the moment how to create a script for this kind of free chat or is it even possible in Renpy, but I'm dead sure that this is not the way to do that. It'll be a PITA for you to create and it still won't work the way other free chat games do.