In [Capitalization of first letter after a dash](https://ell.stackexchange.com/q/5817/54) , it was claimed (with some citations supplied)

> 
> Where are the rules that even say a dash is permissible in a sentence
>  like "I'm in South Ossetia - yes, I managed to get a visa!"?
> 
> 
> 

While I myself would say "I'm in South Ossetia. Yes, I managed to get a visa!", using a dash seems ok to me. I suspect such a conversational style would be frowned upon in formal writing, but that's a separate issue.

Is there a consensus against using the dash this way?