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:       I ’ ll be away for a moment .  
 Person2:Yes ? Anything I can do for you ?  
 Person1:        Look ! I ’ v been watching that man down in the street . He keeps peeping into the shop . Keep your eyes skinned for that guy , will you ?  
 Person2:Ok . 

formal