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:       What ? Your diamond ring is lost ?  
 Person2:Yeah , I just cannot find it anywhere .  
 Person1:        It must have been stolen by the few thieves . I ’ ll get it back for you .  
 Person2:You are risking your neck . Don ’ t you know they have guns . 

formal