input: Write a function called generate_response that takes a string input representing a question and returns a string response based on a predefined dictionary of answers. If the question is not in the dictionary, the function should return a randomly chosen default response. Implement this function in Python and ensure it handles user input in a while loop until the user says 'Goodbye'.
  
  assert generate_response('What is XYZ?')=='XYZ is a company that provides XYZ services.'
  assert generate_response('How does XYZ work?') in ['I am not sure I understand.', 'Can you give me more information?', 'Can I help you with something else?']
  assert generate_response('Where is XYZ located?')=='XYZ is located in ABC city.'
  assert generate_response('Goodbye') in ['I am not sure I understand.', 'Can you give me more information?', 'Can I help you with something else?']
  assert generate_response('') in ['I am not sure I understand.', 'Can you give me more information?', 'Can I help you with something else?']
output: import random
  
  def generate_response(question):
      responses = {
          'What is XYZ?': 'XYZ is a company that provides XYZ services.',
          'Where is XYZ located?': 'XYZ is located in ABC city.'
      }
      default_responses = ['I am not sure I understand.', 'Can you give me more information?', 'Can I help you with something else?']
      
      return responses.get(question, random.choice(default_responses))