input: def generate_response(question: str, answers: dict) -> str:
      """A simple AI-based chatbot that can answer queries about an XYZ product or service.
      The chatbot uses a predefined dictionary of question-answer pairs and generates 
      responses randomly for unknown questions. The conversation ends when the user 
      inputs 'Goodbye'.
  
      >>> generate_response('What is XYZ?', {'What is XYZ?': 'XYZ is a company that provides XYZ services.'})
      'XYZ is a company that provides XYZ services.'
  
      >>> generate_response('What does XYZ do?', {'What does XYZ do?': 'XYZ helps customers find solutions to their problems.'})
      'XYZ helps customers find solutions to their problems.'
  
      >>> generate_response('Unknown question', {'What is XYZ?': 'XYZ is a company that provides XYZ services.'})
      'I am not sure I understand.'
      """
output:     if question in answers:
          return answers[question]
      else:
          return 'I am not sure I understand.'