input: Write a python function to simulate a customer service chatbot that greets the user with a random message from a list of greetings.
  assert chatbot_responses(["hi", "hello", "quit"]) == ["Hi, how can I be of assistance?", "Hi there, how can I help you today?"]
  assert chatbot_responses(["help", "support", "quit"]) == ["Hi, how may I help you?", "Hi there, how can I help you today?"]
  assert chatbot_responses(["question", "quit"]) == ["Hi, how may I help you?"]
output: import random
  
  def chatbot_responses(messages):
      greetings = [
          "Hi, how can I be of assistance?",
          "Hi there, how can I help you today?",
          "Hello! How can I assist you?",
          "Hi, how may I help you?"
      ]
      
      responses = []
      for message in messages:
          if message == "quit":
              break
          else:
              responses.append(random.choice(greetings))
      
      return responses