Tell Me About It.
Let’s talk about what’s on your list.
Tell me what you're working on.
If I'm not the right person for it, I'll say so and point you toward another solution.
Helpful to include, but not required:
Roughly what the project is
When you need it
Whether it's a one-off or something ongoing
No need for a formal brief. A few sentences is plenty — working out the rest is of the job.