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:       Why are you so crazy about bird-watching ? What do you get out of it ?  
 Person2:Looking at the beautiful creatures and listening to their songs are such wonderful experiences . I feel as if I'm in direct contact with nature .  
 Person1:        Really ?  
 Person2:You bet . You should try it yourself . 

informal