French phrase
En attente de votre retour.
Meaning
Awaiting your response.
When to use it
A concise request for a reply. It ranges from casual to somewhat formal and need not signal urgency.
Example dialogue
J'ai envoyé ma proposition hier. En attente de votre retour.
I sent my proposal yesterday. Awaiting your response.
D'accord, je vous réponds ce soir.
All right, I'll reply this evening.