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:       Did Roll win the race ? 
 Person2:Yeah , he did . But he only won it by a hair's breadth . 
 Person1:        But anyway , he won at last . 
 Person2:Yeah . To win is the most important thing . 

formal