Python chatterbot problem

chatterbot_test

from chatterbot import ChatBot
from chatterbot.trainers import ListTrainer, ChatterBotCorpusTrainer
from flask import Flask, jsonify

app = Flask(__name__)

print("--- setting up chatbot...", end="")
chatbot = ChatBot("Hansbot",
                  storage_adapter="chatterbot.storage.JsonFileStorageAdapter",
                  output_adapter="chatterbot.output.OutputAdapter",
                  output_format="text",
                  logic_adapters=[
                      "chatterbot.logic.BestMatch"
                  ],
                  database="./database.json")
print("done")

print("--- training chatbot...", end="")
chatbot.set_trainer(ChatterBotCorpusTrainer)
chatbot.train("chatterbot.corpus.german",
              "chatterbot.corpus.german.greetings",
              "chatterbot.corpus.german.conversations")
print("done")

def ask_chatbot(request):
    dialog = {
        "id": 1,
        "usersay": request,
        "botsay": chatbot.get_response(request),
        "botsay2": response
    }
    return dialog

print("--- defining rest functions", end="")
@app.route('/conversation/<request>', methods=['GET'])
def conversation(request):
    print("--- conversation service called")
    print("request: " + request)
    dialog = ask_chatbot(request)
    print("dialog: " + dialog["botsay"])
    return jsonify(dialog)
print("done")

print("--- starting server")
if __name__ == '__main__':
app.run(debug=False)