person A: I recently went to ruby falls_comma_ an underground cavern with a waterfall. 
person B: That sounds awesome. Have you ever been before?
person A: Not that particular one_comma_ no. I had butterflies in my stomach on that elevator going down 23 stories.
person B: I wish I could go sometime that sounds like quite the experience.
person A: Overall it was a good time_comma_ but i was nervous being that far underground_comma_ i need to learn to relax and enjoy things.