is this correct? (talk about party)

1:Bore da.
2:Bore da, fi sy'n cynnal parti i Sain. Hoffwn chi ddod?
1: Pryd mae'r parti?
2:Mae parti yn a nos wener.
1:Hoffwn i ddod i'r parti. Pwy arall sy'n mynd i'r parti?
2:Caitlin a Dieno.
1:Iawn. Am faint o'r gloch mae'r parti?
2: 7 o'r gloch tan 9.
1:Ble mae'r parti?
2:Yn fy ty. Sut wyt ti'n mynd i'r parti?
1: N tad ni gyrru fi.

it's meant to say :

1: hi
2: hi, i'm having party for Sain, would you like to come?
1: When is the party?
2:the party's on friday night.
1:i would like to come. who else will be there?
2: Caitlin and Dieno
1: ok, what time is the party?
2: 7 o'clock till 9
1:where is the party?
2: at my house. **something i forgot the meaning of**
1: My dad can drive me.

and yes, i know the words sain and ty have the little house things on them, i just don't know how to put that in answers
oh, and if you are a fluent welsh speaker, don't forget to put that in "sources"!
thx!