As many Japanese learners already know, the particle `ので` is mainly used to
indicate that the preceding sentence/clause should be understood as a reason
that justifies or answers another statement (the best equivalents in meaning
in English would probably be _" because"_ and _" since"_). So, in this usage,
`ので` is perfectly interchangeable with `から`, only differing in politeness
level.

However, as I've seen in many sources (like here: [Function of から in this
conversation](https://japanese.stackexchange.com/questions/30999/function-
of-%E3%81%8B%E3%82%89-in-this-conversation/31006#31006)), **`から` can also be
used in casual speech as a sentence-ending particle that reinforces what it
has been said and gives out an assertive tone** (if I were to choose an
equivalent in English for this meaning, I would probably say an _" I tell ya"_
tag). So, the thing is, **could`ので` be interchangeable with `から` in this usage
too?**

Let me show you an **example of a situation where this may be possible**. This
is a troublesome dialogue I found while reading manga: (to put you in context,
two waitresses talk about a possible new recruit and a male coworker barges
in):

> Adult waitress: 同{どう}級{きゅう}生{せい}入{はい}ったら楽{たの}しいかもよ？
>
> Young waitress: 友{とも}達{だち}作{づく}りで来{き}ている訳{わけ}じゃない **ので**
>
> Young waiter: みてぇなつらら女{おんな} // 誰{だれ}も友{とも}達{だち}になりたかねーよ！

I'm going to write down here my personal interpretation of each line so you
could better understand my doubts and why I ended up making that question
about `ので`.

Let's begin: No problems with the first sentence except for that question mark
right after the `よ` particle. I would never have expected the `よ` particle to
appear in a question given its assertive tone, so I got confused and searched
for similar cases. This is the only thing I found: [How do I interpret this
question that ends with
よ?](https://japanese.stackexchange.com/questions/6524/how-do-i-interpret-this-
question-that-ends-with-%E3%82%88). And from what I understood, `よ?` exposes
info, but in a _" just so you know"_ manner (kinda like a _" keep it in mind"_
tag). Consequently, I would translate the adult waitress's line as:

> 同{どう}級{きゅう}生{せい}入{はい}ったら楽{たの}しいかもよ？
>
> _Things might be fun when a classmate joins (to your job), keep it in mind._

Next is that dreaded line ending in a `ので` that I don't really understand.
Following the "normal" use of `ので` (having the same meaning as the conjunction
_" because"_ in English), the line's translation would be:

> 友{とも}達{だち}作{づく}りで来{き}ている訳{わけ}じゃないので
>
> _Because it's not like I'm coming here to make friends._

However, that feels out of place to me. If the _" it's not like I come..."_
clause should be understood as a reason, which other statement is being
justified/answered? If the young waitress would have said `いいえ` before, or
kept on talking, it would all make sense... but the dialogue is just as I
wrote, nothing was omitted.

I struggled hard to find a meaning, but I got no satisfactory results. Then I
remembered the similitude between `ので` and `から`, and I thought to myself
"maybe `ので` works here as an informal emphatic particle like `から`". So I came
up with this translation attempt:

> 友{とも}達{だち}作{づく}りで来{き}ている訳{わけ}じゃない **ので**
>
> **_There is no way I'm coming here to make friends, I tell you._**

(Notice that given the hypothetical emphatic tone of `ので` here, I decided to
level up the toughness of the `訳じゃない` expression in its translation)

Aaaand finally, the waiter's line. I included this just to show that the young
waitress's line has no continuation. But since we're here, I'm going to give
it a try anyway (this originally came in two different speech bubbles, hence
the slashes):

> みてぇなつらら女{おんな} // 誰{だれ}も友{とも}達{だち}になりたかねーよ！
>
> Look, ice-girl, nobody wants to make friends (with you)!

If anything, I have a minor doubt regarding if he meant _" make friends with
the girl"_ or _" make friends in general"_. It would be great if you could
give me your opinions on this thing too.

And that's all! Sorry for the wall of text. I hope somebody can shed some
light on this question!
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grammar usage sentence-final-particles particle-から
If から can work as an informal emphatic particle, so can ので?
First, I wouldn’t consider either から or ので emphatic particles. They are
助詞｛じょし｝, or more specifically
[[接続助詞]{せつぞくじょし}](https://ja.wikipedia.org/wiki/%E5%8A%A9%E8%A9%9E)
(conjunctive particles, listed further down the linked page).

ので and から are used identically in the structure you have inquired about. In
this construction, rather than ‘because’, think of it as ‘so’.

> ‘I gave up junk food because I’m getting fat.’

versus

> ‘I’m getting fat, so I gave up on junk food.’

As ので is considered more moderate and softer-sounding than から, some modern
women prefer to use this word.

> 同級生入ったら楽しいかもよ？  
>  It might be fun if a classmate joined the team, huh?

よ？ is used pretty often by relatively younger people when making a statement
they feel confident about, yet still looking for confirmation. (若者言葉）.
Alternative to ね？ in this case.

You should follow the から or ので to the sentence’s logical conclusion:

> 友達作りで来ている訳じゃないので（、別にどうでもいい）。  
>  I didn’t come here to make friends (, so I don’t really care).

The final translation (to me) would sound thus:

> みてぇなつらら女、誰も友達になりたかねーよ！  
>  Look here, ice queen. Nobody wants to be your friend anyway!
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answer