I don't think so. If you know the username then it will send the password to email address that you signed up with.
If you don't know the username, then you just put in the email address.
I would say just guess with all possibilities and see which works.
I know the user name, I don't have the email anymore and I dont even remember what it was. I know the username, date of birth and a neofriend. I am wondering if that's enough to put a ticket through?