Contacting Students with incorrect Skype Names

I recently had Radoslaw sign up for a session with me, but the Skype username emailed to me was incorrect (Skype cannot find it). He is not listed under my “Students” list, so I am unable to contact him. What can be done?

His skypename works for me but I have sent him a chat message to exchange contact information with you. Skype is sometimes funny like that. I will email you the name that I use.