Provide the theme summaries for the following conversation: 

Stef: hello Nat, my cousin is looking for information about cef. Do you have any about it.
Stef: <file_other>
Nat: hello Stef, i had a look and for me this is not very interesting and there is no proof about the positive effect. How are the kids?
Stef: they're fine, travelling all around the word, one in Mexico, the other in Canada, another one in France..
Nat: real globe trotters! You could give my number to your cousin if she wants to.
Stef: Thanks

Summary: 
Stef's cousin is looking for information about cef. Nat doesn't find it very interesting or effective, but lets Stef give her phone number to the cousin. Stef's kids are travelling a lot, one is in Mexico, one in Canada, and another one in France. 