Phrases Offering and Refusing Help

Unfortunately, I'm unable to assist at this time.

C2

Meaning

I cannot help now.

Example sentences

John: 'Unfortunately, I'm unable to assist at this time. I have prior commitments.'

Alice: 'Would you mind taking over this shift?'<br>

John: 'Could you review this marketing campaign before launch?'<br>

Alice: 'Unfortunately, I'm unable to assist at this time. I've already reached my workload capacity.'