Provide the theme summaries for the following conversation: 

Cathy: Hey, Melinda wants us to meet her and her husband for dinner on Thursday night. 
Cathy: Are you up for it?
Lewis: Melinda? Do I know her?
Cathy: Lewis. My goodness. Yes, you know her. They were both at Jack's birthday party. 
Lewis: Ha, there were a lot of parent couples at the party. 
Cathy: He wore the Superman shirt and she was always correcting him. 
Lewis: Ha, yeah, now I remember. 
Lewis: Now I definitely don't want to meet them for dinner. 
Lewis: Why would we do this?
Cathy: She really likes us, and I think they are quite alright themselves. I couldn't really find it in myself to say no.
Lewis: You really need to learn to be a bit more assertive. If I agreed to every request sent my way I would never sleep
Lewis: There are so many other things I would rather do that night. 
Lewis: How about you and me just go out and get dinner alone. I will do anything with you, just as long as I don't have to pretend to be friends with some people I have no interest in. 
Cathy: Oh fine

Summary: 
Melinda wants Cathy and Lewis to meet her and her husband for dinner on Thursday night. The two couples had met at Jack's birthday party, where Melinda's husband was wearing a Superman shirt and she was always correcting him. Lewis doesn't want to meet them and prefers dinner with Cathy only.