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:       Excuse me , how can I fill in this blank ? What does marital status mean ?  
 Person2:Are you married ?  
 Person1:        No , I'm still single .  
 Person2:Then , you put S in this blank . 

formal