The 3.5mm audio jack of Audition Pro can also support microphone. If you use it as wired headphones for Skype call, you need an audio cable with microphone.
You can buy one from Amazon here: https://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=audio+cable+with+mic&rh=i%3Aaps%2Ck%3Aaudio+cable+with+mic
Or you can buy from Avantree: http://www.avantree.com/category-avantree-spare-parts-2/audio-cable-with-mic.html (Only available in China warehouse. It takes 15-20 business days to deliver from China.)