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:       Do you know that Mary an Ben have already separated ?  
 Person2:Yeah , I know .  
 Person1:        I didn ’ t know it until yesterday . I put my foot into it , and was even stupid enough to ask when they would get married . 

formal