No, not really. Unity doesn't have a built in Plugin for that but you can easily make your own. Assuming you are making this for Android devices, you need to create a function that shows the dialog in Java then compile it to dll file. For iOS, you need to write a simple function that shows the dialog using objectie-C then compile it to dll.
This DLL Functions can then be called from unity.
http://docs.unity3d.com/Manual/Plugins.html
http://forum.unity3d.com/threads/step-by-step-tutorial-for-c-net-dll-and-unity3d-pro-only.99427/
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