Hello! So I think I messed up and honestly I just want to gauge how bad this could ruin my chances. I originally had an interview scheduled and then received an invite from another school on the same day the first interview was scheduled. I didn't think much of it because the school I originally got an invite from had multiple interview days, so I just called the person who sent the email (someone who works in their psych office) and asked if I could move my interview day to one of the other days. She said that was absolutely fine and I thought nothing of it, they just emailed me about my updated interview with the PI CC'ed, and I replied to the PI and thanked her for her flexibility. Now I've seen a post or two in other places talking about interview conflicts and how bad it is to reschedule. Did I mess up? All I can do now is apologize and profusely thank the PI I applied to for her flexibility again, but I just want to be prepared. Thanks!