You will go through many interviews in your lifetime. Both for jobs and when meeting new people and finding out about them. Right now is a great time to develop those skills using ASL.
Look in your book at unit 10:9, pages 290 - 295. You will perform the interview process as described with one of your group members. You choose who will be A and who will be B. You only need to do it once. If you choose to be person B then you do not need to do a second interview as person A.
If you are person B in the interview, then you must also submit a paper with the chart on the bottom of page 294 or 295 filled out. If you do not want to do the paperwork then you may do a second interview with you as person A.