I'd like to express (via text message) that I'm happy/glad to hear that you'd like to work with us as a volunteer. I omitted the rest of the sentence (about volunteering work) because I have mentioned this before. Here's the scenario:
A: Hi, would you be interested in working as a volunteer at [name of the organization]?
B: Yeah, sure! I think it's just what I need right now.
A: Happy to hear that!
Is the phrase "Happy to hear that" used by native speakers?