Dialog line vs. quotation marks

Ok, I'm stuck with something. I'm writing a book and I am using the dialog line because I come from a country where that is how we write dialog.

Example:

- Hello, she said.
- Hi, he answered.
Now since I moved into an english talking country I noticed the quotation marks.
"Hello", she said.
"Hi", he answered.

I looked everywhere on web but couldn't find the term "dialog line" in english nor an explanation for both. I wonder if my book will be refused by publishers only because I'm using the dialog line. Does anyone know the difference of usage between continents or something?