text: Title: Agent rephrase_query Error
  Body: ### System Info
  
  pandasai version: 1.5.9
  
  ### 🐛 Describe the bug
  
  using latest pandasai version(1.5.9) for rephrase_query, i'm getting the below error.
  
  Code Snippet::
  ```
  config = {
      "llm": llm
  }
  agent= Agent(dfs, config=config, memory_size=10)
  response = agent.rephrase_query(question)
  print(response)
  ```
  
  Error::
  ```
  Unfortunately, I was not able to repharse query, because of the following error:
  'RephraseQueryPrompt' object has no attribute 'conversation_text'
  ```