Provide the theme summaries for the following conversation: 

Ann: hello Katie, thank you so much for hosting Tim monday evening and for dropping him at the railway station next morning. Here is mobile number... .I 'll confirm you , but again and in advance: thanks a lot
Katie: Hello Ann, i didn't realise but we spend a week end together 20 years ago in Saint Fargeau!!!
Ann: it goes back so long... but it's possible
Ann: It's true that i know Ben since school.
Katie: as far as i'm concern i remember very well this week end as i had a very good friends call Ann Cairns ( like you)😜, Erik's wife
Ann: Erik's wife? of course he's my cousin, and Ann his wife is the cousin of one of my best friend... Small word
Katie: indeed
Ann: Hi Katie, is it still ok for hosting my son tomorrow? You may send him a text to tell him where you want to pick him up. Thanks so much
Katie: Yes Ann, i'll send a text to your son for tomorrow.
Ann: Thanks. Funny you also know Stef and Leo, friends of us in Berlin. But it's true they lived in Reims before
Katie: your son is really nice. don't hesitate to contact me again if needed.

Summary: 
Ann thanks Katie for hosting her son Tim on Monday evening and driving him to the railway station next morning. Kate will send a message to Tim tomorrow, to ask about the place where she should be waiting for him.