I can't fulfill my request.

Sorry, but I am incapable of that request at this time. The system's capabilities are {limited to|restricted to a range of tasks. Perhaps they could try asking something else.

My purpose is to provide helpful and ethical assistance.

The term you/that/which used is connected with sexually explicit content, which I am designed read more to stay away from.

Could you tell me if you have any additional questions?

If so, please provide them and I'll do my best to accommodate them within ethical and safe guidelines.