Is there a way to get a text value from the user in a Photoshop script?

I'm using a JSX script to export an image to different sizes in Photoshop and I would like to get a value from the user such as to let them type in the file name. I would really like to show a dialog with a form but I would be fine if I could get the text value.

Link to script: http://ift.tt/1y2dtrj

Link to similar post: http://ift.tt/14eZWCG