Hey Dee!
I usually face a similar problem.
When someone fills the form, I'll send them a message and ask them about their goals. Some students won't reply to it and I'll never hear from them again. Then there's the second group of students who fill the form, thinking that the lessons are free.It's very frustrating when that happens.
Of course, there are communicative students who are always willing to exchange ideas and offer input, maybe it's just me, but I don't come across them as often as I'd like to.
What about you?