Try to work on differentiating your scenes from one another a bit better. As it stands, your voice doesn't seem to change enough to clearly distinguish from one character to the next. Really develop a strong concept behind each of your scenes, and include music and sound effects if necessary to help the storytelling process.

I did notice that you were able to demonstrate some degree of change in vocal inflection, though, which is a good start. Push to draw as much emotion out of your characters as possible; you'll find it will create much more convincing dialogue.

Best of luck with your next reel,
- Vox