I used the TensorFlow Neural Machine Translation model trained with all the Reddit comments from November 2017. Here is an example of an interaction:

Chatbot Interaction

As you can see, it doesn't really work that well. I trained the model on a Paperspace VM that had 30 GB of RAM and a Quatro M4000 GPU for roughly 60k iterations. I didn't get it to a full epoch because of cost and training time, but I believe that it would have had an improvement in the chatbot's performance. The dataset was roughly 10 GB zipped and 60GB unzipped.

Here is what the TensorBoard's Embedding Projector looks like:

Embedding Projector