app.py

import gradio as gr
from transformers import pipeline
from transformers import Conversation

chatbot = pipeline(task="conversational", model="facebook/blenderbot-400M-distill")
conversation = Conversation()

def greet(name, history):
    global conversation
    if len(history) == 0:
        conversation = Conversation()
    conversation.add_message({"role": "user", 
                          "content": name})
    conversation = chatbot(conversation)
    return conversation.messages[len(conversation.messages) -1]['content']

gr.ChatInterface(greet).launch()