“I can assist you with that.”
You work at a clothing store. A customer looks like he's ready to check out. You want to offer to help him, so you say this.
I can assist you with that.
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assist (someone) with (something)
The word "assist" means "help" but is more formal. Use it with customers and other people that you need to speak to respectfully:
How can I assist you?
Can you assist this gentleman with his question?
I can assist you with that.
This is a sentence that employees at stores (like clothing stores, etc.) say to offer help to customers. They say this when a customer is waiting for another employee.
"I can assist you with that" sounds polite and formal.