German phrase
Wann sind Sie ~?
Meaning
When will you be ___?
When to use it
Ask when someone is there. Use it to ask about their location or schedule.
Example dialogue
Wann sind Sie im Büro?
When will you be in the office?
Ich bin am Montag ab 9 Uhr im Büro.
I am in the office from 9 a.m. on Monday.