German phrase
Wozu möchten Sie ~?
Meaning
What would you like ___ for?
When to use it
It asks about intended use. It is a polite way to ask about someone's purpose.
Example dialogue
Ich habe einen Gutschein.
I have a voucher.
Wozu möchten Sie den Gutschein einlösen?
What would you like to redeem the voucher for?