Hi, and welcome!

Corrections indicated in bold.
Qui: Pierre
Oú:
chez Pierre
Quand:
le 2 février À quelle heure: Six heures vingt-cinq (6:25 if Im not mistaken)*
Pour
quoi: Mon anniversaire
*Okay, working with a 12-hour system, that is quite correct, although it generally is written out as 6h25. However, at least here in Quebec, we (at least most of the time in writing) work with 24 hours. Basically just add 12 to the hour for PM, and there you have it. So here it would be "Dix-huit heures vingt-cinq", or 18h25.