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:       Um , which of them is the better typist ?  
 Person2:Well , Mary types faster than Jones . But I think Jones types more carefully .  
 Person1:        Is there any difference in their short hand ?  
 Person2:Jones can certainly take down letter more quickly , but Mary ’ s short hand is the best in her class .  
 Person1:        How about languages ?  
 Person2:Both of them speak excellent French . But I think Mary speaks German more fluently than Jones does .  
 Person1:        Um . That doesn ’ t really matter . Because we have more French visitors than German . 

formal