Use of a Dialog box on Material Design

I'm designing a web app but can't reveal its name and its main function so let's see how this could be explained.

In this app there's a type of user that have the power to Add and Remove Team Members (Employees) so for him to do that I thought well let's make this very easy, he's just going to need to press the "+" button and fill a little form BUT to make it even more seamless let's make that a Dialog box.

Question: Is it right for an user to write stuff on a Dialog box or those are only for information display as alerts, etc.

Below you can enter the link to the Dialog section on Material Design and a screenshot of how this Dialog/Form is going to look (I need to add the lines below every line like any other form but I just stopped after this question popped right into my mind).

enter image description here

https://www.google.com/design/spec/components/dialogs.html#