input: Write a function to create a simple chatbot using Python and Dialogflow, which can answer questions about the current days of the week. The function should handle the interaction using Flask for web requests and Dialogflow for intent detection. If the session_id is not present, it should create one.
  
  from flask import Flask
  from flask_restful import Resource, Api
  from dialogflow import detect_intent_texts
  
  app = Flask(__name__)
  api = Api(app)
  
  @app.route('/', methods=['GET', 'POST'])
  def detect_intent_text():
      IF session_id NOT present
          PLEASE create session_id
      request = detect_intent_texts(session_id, text)
      response = request.fulfillment_text
      return response
  
  if __name__ == '__main__':
      app.run()
  
  assert detect_intent_text("What day is it today?", "12345") == "[Expected response from Dialogflow]"
  assert detect_intent_text("Is today Monday?", "67890") == "[Expected response from Dialogflow]"
  assert detect_intent_text("", "11111") == "[Expected response from Dialogflow]"
output: 
  def detect_intent_text():
      session_id = request.args.get('session_id')
      text = request.args.get('text')
      if not session_id:
          session_id = str(uuid.uuid4())
      request = detect_intent_texts(session_id, text)
      response = request.fulfillment_text
      return response
  