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:       Hi , John . What brings you to town ? 
 Person2:Hi , Mary . Lily wanted me to buy her some things for the party . 
 Person1:        What do you think of the traffic today ? 
 Person2:It ’ s pretty bad . 
 Person1:        Yeah . You can say that again . It ’ s noisy too . 
 Person2:I am glad I did not drive a car . 

informal