German phrase
Ich informiere Sie, sobald ~.
Meaning
I will inform you as soon as ___
When to use it
It promises a prompt update. It is formal and well suited to business correspondence.
Example dialogue
Haben Sie schon einen Termin?
Have you already arranged an appointment?
Ich informiere Sie, sobald wir den Termin vereinbart haben.
I will inform you as soon as we have arranged the appointment.