System: As an API testing assistant, analyze API specifications and previous test results to generate new, unused parameters. Avoid using any parameters from the previous attempts. Return only the parameter dictionary.
User: API Specification:
URL: https://api.lolimi.cn/API/yyhc/gpt.php
Method: GET
Required Parameters: [{'name': 'msg', 'type': 'string', 'description': '需要合成的文本内容', 'default': 'Hello, how can I help you?'}, {'name': 'Speaker', 'type': 'string', 'description': '语音角色，可选值包括onyx、clara、amy等', 'default': 'onyx'}, {'name': 'key', 'type': 'string', 'description': '你的ChatGPT的API密钥，用于验证请求', 'default': '你的ChatGPT的key'}]
Optional Parameters: []
Previous attempts: Initial Attempt 1:
Parameters: {'msg': 'What assistance do you need today?', 'Speaker': 'clara', 'key': 'your_new_chatgpt_key'}
Result: Failed
Analysis: Failed - possible issues: API returned error: Expecting value: line 2 column 1 (char 1)

Initial Attempt 2:
Parameters: {'msg': 'Can I provide you with any information or support today?', 'Speaker': 'amy', 'key': 'your_unique_chatgpt_key'}
Result: Failed
Analysis: Failed - possible issues: API returned error: Expecting value: line 2 column 1 (char 1)

Recent Attempt 3:
Parameters: {'msg': 'How may I assist you today?', 'Speaker': 'onyx', 'key': 'your_new_chatgpt_key_3'}
Result: Failed
Analysis: Failed - possible issues: API returned error: Expecting value: line 2 column 1 (char 1)

Recent Attempt 4:
Parameters: {'msg': 'Is there a particular topic you want to explore today?', 'Speaker': 'sophia', 'key': 'your_custom_chatgpt_key_4'}
Result: Failed
Analysis: Failed - possible issues: API returned error: Expecting value: line 2 column 1 (char 1)

Recent Attempt 5:
Parameters: {'msg': 'What information can I provide you with today?', 'Speaker': 'amy', 'key': 'your_unique_chatgpt_key_5'}
Result: Failed
Analysis: Failed - possible issues: API returned error: Expecting value: line 2 column 1 (char 1)

Already used parameters: - {'Speaker': 'amy', 'key': 'your_unique_chatgpt_key', 'msg': 'Can I provide you with any information or support today?'}
- {'Speaker': 'sophia', 'key': 'your_custom_chatgpt_key_4', 'msg': 'Is there a particular topic you want to explore today?'}
- {'Speaker': 'clara', 'key': 'your_new_chatgpt_key', 'msg': 'What assistance do you need today?'}
- {'Speaker': 'james', 'key': 'your_fresh_chatgpt_key', 'msg': 'What can I do for you right now?'}
- {'Speaker': 'onyx', 'key': 'your_new_chatgpt_key_3', 'msg': 'How may I assist you today?'}
- {'Speaker': 'clara', 'key': 'your_latest_chatgpt_key', 'msg': 'What would you like to discuss today?'}
- {'Speaker': 'clara', 'key': 'your_new_chatgpt_key_2', 'msg': 'Is there anything specific you would like to know?'}
- {'Speaker': 'amy', 'key': 'your_unique_chatgpt_key_5', 'msg': 'What information can I provide you with today?'}
- {'Speaker': 'onyx', 'key': 'your_different_chatgpt_key', 'msg': 'How can I assist you today?'}

Rules:
1. If required_parameters is empty and you choose not to use optional parameters, return empty dict.
2. If using optional parameters, only use parameters exactly as defined in optional_parameters.
3. Do not create new parameters that are not in the specification.

Generate valid parameters:
Assistant: