How can I make the assistant call the function every time?

API
1 
{
  "name": "_getCurrentTime",
  "description": "Get the current time",
  "strict": false,
  "parameters": {
    "type": "object",
    "properties": {},
    "required": []
  }
}

I created a chatbot assistant and implemented a simple function.
(_getCurrentTime() returns the current time format ‘HH:mm’.)

The first time I asked, “What time is it now?”, the assistant returned a requires_action status, and I got current time “11:30.”

But the second time I asked the same question, the assistant did not return a requires_action status and I got “11:30.” again.

After that, no matter how many times I try, it doesn’t call the function and just returns ‘11:30’.

How can I make the assistant call the function every time?