How to insert a end-sequence

I am new to HuggingFaces and I am trying to use the GPT-Neo model to generate the next sentence in a conversation (basically like a chatbot).

I tried around with GPT-3 before, and there I was using “Me:” as an End-Sequence to ensure the model would stop generating when it genrated the Text “Me:” (which indicates that it is my turn to say something).

Is there a similar option for GPT-Neo?