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 never ever work together with him ! 
 Person2:What happened ? Quarrel again ? 
 Person1:        Will you take my materials back from him for me ? Please ! 
 Person2:Don't ask me . I don't wanna be involved in your quarrel . 

informal