[texhax] Options in environment dialogue

[Darío]

Hello everyone! I am working in a theater dialogue, but using the 
dialogue package i get for example:
the code
\begin{dialogue}
    \speak{Coro} blabla
    \speak{Prometeo} BLABLA
\end{dialogue}
after compile:

CORO: blabla
PROMETEO: BLABLA

I need something like thus:

CORO. - bLABLA
PROMETEO. - BLABLA

I read dialog.dvi and I did not find any property to change it.

Do you have any solution?

Thanks a lot!
Darío