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:       You mean it shuts off to save energy ?  
 Person2:Yep . And it breathes , see !  
 Person1:        It's not breathing !  
 Person2:Yes , it is . Look at the little light ! It blinks off and on .  
 Person1:        Jen , it's not alive ... but it does look user-friendly .  
 Person2:I would look so cool carrying this around !  
 Person1:        And you'd look so cool ! 

formal