Definition: You are given a conversation between two people. 'Person1:' and 'Person2:' are used to separate their respective dialogues. You are required to assign a label 'formal' if there is an absence of emotion and a presence of questions anywhere within the conversation. If such pattern is not found assign the label 'informal'.
Input:  Person1:       Boris , look at this sentence . " Healthy eating is not about strict nutrition philosophies , staying unrealistically thin , or depriving yourself of foods you love . " It's interesting , isn't it ? 
 Person2:I'd rather say it's confusing . what are those " strict nutrition philosophies " about ? 
 Person1:        I believe they are careful calculations on proteins , vitamins and calories . 
 Person2:Probably , Iris . That must be the job of nutritionists . 
 Person1:        Healthy eating is not about depriving oneself of the foods one loves . So we are free to have whatever foods we love . It is unbelievable . 
 Person2:Oh , believe it or not , I came across an article the other day , saying that pizza is a healthy food . 
 Person1:        Seriously ? 
 Person2:Yes , I felt exactly the same way as you did just now . Scientists must be crazy in saying so . 
 Person1:        Maybe nowadays people hold different opinions on healthy diet . 
 Person2:Absolutely . I myself sometimes believe that healthy eating is just about feeling great . As long as I have enough energy , it's fine . 
 Person1:        But one must have some basic ideas about nutrition and find the best way for it to work out for the body . 

informal