I'm A palestinian guy and Here is what you wrote in Palestinian Arabic if you wanna master it:
Marhaba. Ana ismi Alena. Eish Ismak/ismek? Ana mn Canada w ba'eish bDubai. Mn wein enta/entie?
مرحبا. أنا اسمي ألينا. إيش اسمَك\اسمِك؟ أنا من كندا وبعيش بدبي. من وين انتا\انتي؟

For me my answer would be:
Ana Wael. mn Falastien w ba'eish bSouria(Syria).
أنا وائل. من فلسطين وبعيش بسوريا

Marhaban!

Marhaban. Ana ismi Alena. Ismoka/ismoki? Ana min Canada wa ana a'aeesh fi Dubai. Min ayna anta/i?

hi , ur arabic is very good , but u have 2 mistakes 

the first is : u must said Marhaba not Marhaban

the second is : u must put "ma" before Ismoka/Ismoke, "ma" means "what is"

and finally thank u to listening to me

I'll correct by transorming to Palestinian ;)

Marhaban!

Marhaban. Ana ismi Alena. Shu Ismoka/ismoki ismak/ismek? Ana min Canada u 3ayshe bi wa ana a'aeesh fi Dubai. Min ayna anta/i wen inte/inti?

Marhaban!

Marhaban. Ana ismi Alena. ma Ismoka/ismoki? Ana min Canada wa ana a'aeesh fi Dubai. Min ayna anta/i?

you should add the Ma or you could add ash. ma or ash means: what

ما آسمك 

آيش آسمك