I'm trying to come up with a dialogue that follows these rules, but it gets weird fast.
You ghoulishly sloush around the aisles, avoiding eye contact at all cost, but still a customer talks to you:
C: "Hi, excuse me. I'm looking for tomatoes."
You: "We are out for today."
C: "Oh, that's unfortunate."
You: "" (still avoiding eye contact)
C: "Well, how about I come back tomorrow?"
You: "There will be a new shipment of tomatoes by tomorrow."
C: "Okay, great! Then I just come back tomorrow?"
You: "If you come back tomorrow, there will be a new shipment of tomatoes."
C: "Are you alright?"
Avoiding eye contact, you silently slither away.