French phrase
En échange, nous demandons ~.
Meaning
In return, we ask for ___.
When to use it
Requests something in return for an offer. Polite, but it can signal a condition in negotiations.
Example dialogue
En échange, nous demandons votre collaboration.
In return, we ask for your cooperation.
Avec plaisir, de quoi avez-vous besoin ?
With pleasure. What do you need?