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:       Miss Wang , would you mind my asking you a personal question ?  
 Person2:No , not at all.Go ahead .  
 Person1:        Are you married ?  
 Person2:Yes.Is that so important ?  
 Person1:        Frankly yes.We like to employ married people.By the way , do you have any children ?  
 Person2:Yes , I have a three-year-old son . 

formal