[BUG] Issue with No module named 'openai.types.beta.threads.messages

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**Describe the bug**
No module named 'openai.types.beta.threads.messages

**To Reproduce**
Steps to reproduce the behavior:
1. Go to /Users/wanmeng/repository/AI-in-a-Box/gen-ai/Assistants/notebooks/sales_copilot/two_agent_copilot_proxy.ipynb
2. Run the 'import' code
4. See error
---> [13](https://file+.vscode-resource.vscode-cdn.net/Users/wanmeng/repository/AI-in-a-Box/gen-ai/Assistants/notebooks/sales_copilot/~/repository/AI-in-a-Box/gen-ai/Assistants/notebooks/sales_copilot/AssistantAgent.py:13) from openai.types.beta.threads.messages import MessageFile
[14](https://file+.vscode-resource.vscode-cdn.net/Users/wanmeng/repository/AI-in-a-Box/gen-ai/Assistants/notebooks/sales_copilot/~/repository/AI-in-a-Box/gen-ai/Assistants/notebooks/sales_copilot/AssistantAgent.py:14) from openai.types import FileObject
[15](https://file+.vscode-resource.vscode-cdn.net/Users/wanmeng/repository/AI-in-a-Box/gen-ai/Assistants/notebooks/sales_copilot/~/repository/AI-in-a-Box/gen-ai/Assistants/notebooks/sales_copilot/AssistantAgent.py:15) from PIL import Image

ModuleNotFoundError: No module named 'openai.types.beta.threads.messages'

**Expected behavior**
A clear and concise description of what you expected to happen.

**Screenshots**
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**Please complete the following information:**
- OS: [e.g. Windows] MacOS
- Browser [e.g. chrome, safari]
- Version [e.g. 22] Python=3.12

**Additional context**
Add any other context about the problem here.

Open gen-ai/Assistants/notebooks/sales_copilot/two_agent_copilot_proxy.ipynb and the referenced AssistantAgent.py, especially line 13. Reproduce the import failure with Python 3.12 and inspect the project's dependency setup. Done means the notebook's import code runs without the reported ModuleNotFoundError.

Written by the indexing model from the issue text.