Yo i had this problem aswell, for anyone else that wants to make the chats easier to handle if the player choses their own name, this is how i did it:
search for " if speaker == phone_data['name']: "
and replace with if " speaker == phone_data['name'] or speaker == "PLAYER": "
then in your conversations just use PLAYER as the name of the sender:
{"PLAYER": "You seemed a bit quiet tonight. Everything good?"},
{"Nora": "I'm fine. Just taking it all in."},
{"PLAYER": "Fair enough. It's weird being back."},
{"Nora": "A little"},