French phrase
Je suis en mission chez ~.
Meaning
I'm on a business trip at ___.
When to use it
States that someone is away on work at a specific place. It often signals a temporary absence for a client visit or other work duty.
Example dialogue
Je suis en mission chez un client.
I'm on a business trip at a client's.
D'accord, à plus tard et bon courage !
Okay, see you later, and good luck!