Provide the theme summaries for the following conversation: 

Nathalie: have you thought about the holiday?
Pauline: me & tony are into greece really
Jacob: anywhere warm and sunny. greece cool
Anthony: greece is warm sunny and cheapish
Nathalie: i guess cob we ok w that
Jacob: sure thing
Pauline: so august as we said?
Jacob: thats the thing. we need to be back by aug 10
Anthony: what?? why??
Nathalie: sis wedding
Pauline: your lil sis getting married?!? lol
Jacob: she's not little. seen her tony?
Anthony: worth a look?
Nathalie: shut up assholes. shes my sister for fucks sake
Pauline: idiots
Jacob: come one just kidding. we love you
Anthony: we have no choice XD

Summary: 
Nathalie, Pauline, Jacob and Anthony are thinking about spending holidays in Greece together in August. Jacob and Nathalie need to be back by August 10 because of Nathalie's younger sister's wedding. 