You're the Uber Eats or Deliveroo driver. You've delivered someone's order, but there's something missing/ part of the order is wrong.
The customer gets SHIRTY with you (angry/frustrated).
You can reply:
"Please contact the restaurant directly. I just deliver the sealed bag. I don't pack the food."

Someone knocks on your door and says:

Would you like your roof retiring? Your tiles look worn out / slippery / broken ...
You can say:
Can I get a quote? (price)
No thank you, I'm not interested.

I'm here to tell you about our new church group / Would you like to donate to...
You can say:
I'm sorry, I can't afford the time right now.
Do you have any literature I can read?

You ask your neighbours:
Can I have the number of your:
window cleaner?
gardener?
baby sitter?
cat/dog sitter?
mechanic?
...