The basic question form:
To the otherwise unmodified sentence, add "izit" at the beginning.
No other change & no question mark.
Where English uses vocal emphasis to pick on specific words to question, but cannot show that in writing, place the "izit" directly in front of that specific word.
So the following questions are all slightly different:
izit You are going to Tokyo by Air France tomorrow with Jane.
You are going to izit Tokyo by Air France tomorrow with Jane.
You are going to Tokyo by izit Air France tomorrow with Jane.
You are going to Tokyo by Air France izit tomorrow with Jane.
You are going to Tokyo by Air France tomorrow with izit Jane.
Putting izit right at the start is the general, unemphasised, question form.
