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:       I don ’ t know what activity my son should take part in ?  
 Person2:Many children are learning drawing , dancing , swimming and so on in their spare time . You can follow suit .  
 Person1:        But each children has his own interest .  
 Person2:Well , you should talk with your son and let him make his own decision . 

formal