Hello, I'm a student in Nigeria and we will be on holidays from the whole of october but we are to resume by november of which I'll be in my final year,my US visa interview is in 5days time, I have not travelled before,and I am being invited by a white friend(American precisely) and he is very reputable, he'll cater for all my expenses and accommodation while I'm there, he has been to Nigeria severally and I have known him for 3years now...what are my chances of getting this visa??