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:       Looks like a good party , I probably know about half the people .  
 Person2:Who ’ s that boy ?  
 Person1:        Where ?  
 Person2:The one next to the telephone .  
 Person1:        I don ’ t know . Never saw him before . Why ?  
 Person2:I think he ’ s the boy who just moved into my apartment building . 

formal