[Tagging] New tag?

[Diego Woitasen]

Hi,
 I started to contribute to OSM a few weeks a ago. I have question. In
Argentina we have an special car service (I think this exists in other
countries, but I'm not sure) called "remis" o "remisse". It's similar
to taxis but the cars (with drivers) wait always in the agency o remis
stop (You can't take them on any place like the Taxis).

 I haven't found a tag that matches with this. Should I create a new
tag?. Or there is already a tag that I can use.

Regards,
 Diego

-- 
Diego Woitasen