Casper: Yo mate. 
Casper: Remind me please, because I have a problem to remember this one
Casper: When is Sebastian's birthday?
Andrew: I think it was 19th
Andrew: At least I think it is
Andrew: This day is so hard to remember. If it was an even number, at the begining, or at the and of October, it would be a lot easier.
Casper: Hahaha. I thought I only had this problem to remember :)
Andrew: Ok. I confirm it's 19th
Andrew: <file_photo>
Andrew: I'm a devoted fan of "search in conversation" option in Messenger.
Casper: Nice!
Casper: Everyone's got that 1 friend who has Facebook skills as he worked for the FBI!
Andrew: Hahahah! To many crime stories mate!
Casper: Maybe. 
Using the "search in conversation" option in Messenger, Andrew confirms Sebastian's birthday is on the 19th.