The Art of Saying No

I need help formulating an effective "no" response for a work situation.

As a [YOUR ROLE], I've been asked to [DESCRIBE REQUEST], but I'm concerned because [YOUR HESITATION].

Using the PLANT framework (Pause, Listen, Assess, Name, Translate), help me craft a response that:
1. Acknowledges the request respectfully
2. Clearly identifies my specific concern
3. Explains the impact or risk
4. Offers a constructive alternative or compromise
5. Anticipates potential pushback and how I might respond

Provide specific language I could use in this situation.