If someone asks you, say, "Is there a dollar store around here?" and you're pretty sure there aren't any dollar stores in the area, what would be a grammatically correct (and gentle-sounding) way to tell the person "No"?
- I’m afraid not.
- I'm afraid there is none.
- I don’t think there is one.
- I don't think there aren't any.
Which one is correct/best? (I get confused about none/not one/not any, etc.)
Thank you in advance for any advice.