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:       Look ! There's even a built-in handle to carry it with .  
 Person2:But it's so thin . There's no way that it comes with a CD-ROM .  
 Person1:        Oh , yes , it does . Look , here it says that the CD-ROM is built-in !  
 Person2:What other features are listed ?  
 Person1:        It says that it comes in teal and tangerine .  
 Person2:Totally cool colors !  
 Person1:        And it says that it sleeps . 

formal