In a nutshell, this is generally how the conversation usually goes:
New acquaintance/teacher: So what do you do for a living/in my classroom?
Me: I go to the classroom with a student and I provide real-time captioning. Basically I type really fast while the student watches what I type to provide communication access.
New acquaintance/teacher: Oh really? That's cool. So you do the sign language stuff then?
Me: No. (*thinking* Did I mention ASL anywhere in that response?)