Multi-turn tool-use scenario.
Tools involved: TradingBot
MathAPI

User requests (one per turn):
user: Update the market status for me, as I need to know the current outlook.
user: After determining the current market status, I require the stock details for a specific company. Retrieve the information for the stock symbol 'AAPL'.
user: Using the current details of a stock, calculate the average of price, trading volume, MA5, and MA20.
user: The stock should be AAPL.

Expected function call sequence:
TradingBot.get_current_time
TradingBot.update_market_status
TradingBot.get_stock_info
MathAPI.mean