German phrase
Darf ich Sie um ~ bitten?
Meaning
May I ask you for ___?
When to use it
It is a polite request. Use it to ask someone for something in formal or service settings.
Example dialogue
Darf ich Sie um Ihren Ausweis bitten?
May I ask you for your ID?
Ja, gern. Hier, bitte.
Yes, of course. Here you are.