Prompt tech for value after after workflow initiates

We are trying to figure out a way to prompt a tech for a parameter value after a change workflow kicks off.   Ideally what we would like to happen is a tech adds an end user to an AD group.  When that happens they are then prompted for a PC name for that user.  They put the PC name in and that value is passed back to the workflow and then the workflow adds that PC to another group once an approval is done.   

Possible?