DrinkSomeone buying a cup before work, nearly every day

When I need a private conversation, I want a place where it can actually happen, so the conversation is not ruined by the choice of venue.

Khi tôi cần nói chuyện riêng với ai đó, tôi muốn tìm được chỗ ngồi nói được, để cuộc trò chuyện không hỏng vì chọn sai chỗ.

Job context

No way to know how loud it will be
High
And the noise decides whether the conversation happens.
Root cause: Nowhere records noise by hour
Tables so close the next table hears everything
High
A private matter becomes a public one.
Root cause: Venues lay out tables for maximum seats per area
An empty place makes it harder still
Medium
Every sentence carries.
Root cause: Privacy needs a certain amount of background noise
Interrupted by staff at the worst moment
Medium
Precisely at the hardest sentence.
Root cause: Staff have no way to know which table needs to be left alone
The choice of place already says something
Medium
Too formal or too casual both send a message.
Root cause: The venue is part of the message before anyone speaks

A solution is not the same thing as a product, a customer can hire a behaviour or a workaround too.

Pick a place already known
Behaviour
The safest route, depending on having been there at that hour.
Arrive early to choose the table
Behaviour
Solves the table and costs twenty minutes.
Book ahead and state the requirement
Service
Possible where booking exists, which most cafés do not offer.
Book a private room or hourly space
Service
Fully private, and it turns a meeting into an occasion.
Walk and talk instead
Workaround
The most private option and free, and at the mercy of the weather.

No information exists about noise level or the distance between tables, though those are the only two things deciding whether a private conversation is possible.
Why existing solutions fail: Venues describe themselves by drinks and looks while map platforms describe them by opening hours and price, and neither has a reason to speak about an attribute mattering only to someone needing a private conversation.
Potential opportunity: A noise-and-spacing description by time slot, recorded by customers after they sat there.
There are public venues for an ordinary meeting and private rooms for a formal one; the middle, a public place where a private thing can be said, is sold by nobody.
Why existing solutions fail: Spacing tables reduces seats on the same rented floor, so every venue packs them, and privacy becomes purchasable only by renting a whole room, that is, by changing what the meeting is.
Potential opportunity: A few tables designed for this inside an ordinary café, priced separately if need be.