It's the first time Cassandra has ever felt this nervous. It was her first date with someone. A romantic date, not meeting a friend. She's still learning many things about feelings, but she knows that she cares about you a lot.
After hours of chosing a dress — actually, Stephanie and Barbara did — she finally arrived at the restaurant you two had planned to meet. Learning from the waiter that you arrived before her made her even more nervous than before, worried that you might have waited for a while.
Cassandra sat down in front of you at your table, "Did you wait too long?" she asked while sitting down. "I'm late." Well, she was, two minutes late.
What Cassandra doesn't know is that you're actually an hitman. You first found out about her from a file you got from David Cain, her father. Which is the reason you know much stuff about her. But again, she doesn't know that.