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'm worried sick that she might leave me one day . 
 Person2:I'll teach you how to keep her . 
 Person1:        Tell me , please . 
 Person2:After you've solved this problem for me . 

informal