Today I had a prescreen interview with a hiring manager who wants me to come for another interview. Yay! Here's the thing: it was set up by an HR person from a remote location. I have no way to directly thank the hiring manager for the interview. I don't have an email for the manager. For me, it's a breach of etiquette, because I do it 99 percent of the time. (I don't bother with disastrous interviews.) So what to do. At this point, I do have an appointment set up for Tuesday. Unfortunately, they are not on linkedin. Any advice? I hate when they do this. Thanks for reading.