I was wondering how i can have messenger automatically reply to messages?

For example, when someone says hi, hello, hey, hiya, heya etc theres a script which automatically replies. Is there any way to automatically having the messenger reply to most messages?

for example when someone says how're you, have it set to say, good thanks, you?

when someone says bye have it set to say goodbye

when someone says i love you, have it say i love you too

when someone says i'm bored, have it say i'm bored too


etc etc

How can i do this or does anyone have a script that can?