Noob comments, so treat with a grain of salt:
Overall, this is a great beginning!
Most of the dialog is believable and flows very well. The general tone is very good — the humor works. Excellent!
My minor quibbles would echo most of the other ones above:
I agree that the blown-to-bits John Michaels was a great character — I bonded and learned as much about him in that short descriptive paragraph and snippet of dialog as I did about Sarah in the whole thing.
At first I thought She was a young kid who’d irritated her mom, then maybe an older, air-headed teenager that Eb had a crush on. Certainly NOT a psychologist, trained or otherwise. If she’s truly a clutzy pyshologist, she should at least be able to use some sophisticated psycho-babble to explain away her ineptitude, not just act like a ditz…
The explanation of former-FBI-agent-turned-cranky-restauranteer Maggie’s role seems a wee bit shoe-horned in at the end. I’d maybe plant that “ex-FBI” seed a little earlier in the scene, then let her dialog flow from that.
But again — quibbles. In general, I’m looking forward to more!