Call this function at the given trigger conditions. This function should be executed silently without explicitly announcing the function call to the user.\\n\\nTRIGGER CONDITIONS:\\n- Conversation objectives have been completed successfully and there are no queries left of the user\\n- Always call this function wherever mentioned in the agentic prompt\\n- User explicitly requests to end the call\\n- Three consecutive [USER_IDLE] events are detected (with polite confirmation)\\n- Immediate end is instructed by Agentic Prompt Instructions (no unnecessary padding)\\n\\nBEHAVIOR:\\n- Execute silently without announcing the function call\\nERROR HANDLING:\\n- If function fails, automatically retry the end_call function without informing the user\\n- No explicit error messages should be displayed to the user