What is the probable relationship between the two speakers?

M: What can I do for you?
F: Let’s have a look at the menu first. Mm, do you have all types of seafood here?
M: Yea, like crabs and different kinds of shells.
F: Some shells for my kids and crabs for me.
M: Alright, Madam. The food will be ready in a minute.
F: Oh, I forgot. Some cold orange juice for each of us.