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:       John dates her seven times a week .  
 Person2:Really ? That's a straws in the wind .  
 Person1:        I think so . Maybe he's fallen for her .  
 Person2:Yeah . They suit each other . A perfect match between a man and a girl .  
 Person1:        Right . 

informal