I'm translating an email of a company that sells virtual classes and I'm wondering if I should use Usted or Tu. The email is basically to encourage people to take classes. For example:
We notice that youhave registered for classes with XX, but have not taken a class yet. What are you waiting?"
Any suggestions? I'm not sure who the target audience will be but I think It will be used in the U.S.
Thanks in advance!