It is not big question to make such a programme
Simple procedure is as below
construct a web site having query area
person will enter  the area and expected time  to reach
there. Store it in database (Access, sql server.)
create a program in server side.
in which you may have whether any driver  is
available in any particular time it is to be
entered. if available then get the place where it
is to be reached. you have to keep a chart in the
client program stating location in list or combo box.
when the client  user entered the area you can get the
expected time to arrival there.

You can instantly show the client whether driver or
cab can reach there or not.