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 . What's up ?  
 Person2:Nothing much . What's new with you ?  
 Person1:        Not too much . I've been pretty busy .  
 Person2:Me too . Seems like all I do is eat and sleep .  
 Person1:        Gotta go . Call me tonight .  
 Person2:Okay . Check you later . 

formal