It’s important to ask at least one question. The interviewer has shown interest in you, now it’s times to show some interest in them.
“Actually, I do have a question…
#1 “What do you enjoy most about working at [Company XYZ]?”
#2 “What does a typical day look like for someone in this position?”
#3 “What are the typical projects that a [Job title] at [Company XYZ] would be working on?”
#4 “What are the most immediate projects that need to be addressed?”
#5 “What are your expectations of a [Job title] for the first 30/60/90 days?”
#6 “What are the next steps in the interview process?” Or “Where do we go from here?”
“Thanks for giving me this opportunity” , followed by something nice about the interaction.