You may want to try Pilot2ATC, as that does a great job of voice recognition (and is generally a much better ATC system).
Alternatively VATSIM allows you to have a real person for your ATC but, depending on where you are in the world, coverage can be limited.
Both have quite a steep learning curve and can be a little intimidating to begin with (VATSIM in particular, as you are dealing with a real person) but they are both great resources, with Pilot2ATC being a great stepping stone up to VATSIM.