input: Write a function that creates a simple chatbot using Python and state diagrams, with the states defined as dictionaries containing messages and possible replies. The function should initialize the chatbot and allow user interaction through a loop where the current state is updated based on user input. If the user input is not understood, the chatbot should prompt the user to try again. The conversation should end if the chatbot reaches a terminal state without any replies.
  
  assert chatbot_interaction()
  # Output: No explicit output, as this function simulates a chatbot conversation. The output will depend on user input during runtime.
output: def chatbot_interaction():
      states = {
          'start': {
              'message': 'Hello! How can I help you today?',
              'replies': {
                  '1': 'state1',
                  '2': 'state2'
              }
          },
          'state1': {
              'message': 'You chose option 1. What would you like to do next?',
              'replies': {
                  '1': 'state3',
                  '2': 'state4'
              }
          },
          'state2': {
              'message': 'You chose option 2. What would you like to do next?',
              'replies': {
                  '1': 'state5',
                  '2': 'state6'
              }
          },
          'state3': {
              'message': 'You are in state 3. This is a terminal state.',
              'replies': {}
          },
          'state4': {
              'message': 'You are in state 4. This is a terminal state.',
              'replies': {}
          },
          'state5': {
              'message': 'You are in state 5. This is a terminal state.',
              'replies': {}
          },
          'state6': {
              'message': 'You are in state 6. This is a terminal state.',
              'replies': {}
          }
      }
  
      current_state = 'start'
  
      while states[current_state]['replies']:
          print(states[current_state]['message'])
          user_input = input("Enter your choice: ")
          if user_input in states[current_state]['replies']:
              current_state = states[current_state]['replies'][user_input]
          else:
              print("Sorry, I didn't understand that. Please try again.")
  
      print(states[current_state]['message'])
      return True