I'll be with you in a moment.

Meaning

I will assist you shortly.

Examples

• John: 'I need some help with this form.'<br>
• Alice: '<b>I'll be with you in a moment.</b> Just finishing this call.'
• John: '<b>I'll be with you in a moment.</b> I'm dealing with an urgent email.'
• Alice: 'Could you review this document?'<br>