PL/SQL :: Validating Connection From Batch File?

I am trying to create a .bat file where I need to take inputs for below variables

DNAME
UNAME
PSWD
So I have done like this
SET /p DNAME="Enter the Database Name "
SET /p UName="Enter the Username "
SET /p Pswd="Enter the Password "

Now I need to validate whether I am able to establish the connection

sqlpus -s "%UName%/%Pswd%@%DNAME%"

if the above connection is valid one then perform certain action else need to echo user that Access is denied.

(ex: I am trying to say if cond is valid

stmt-1
else
echo message to user. )