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:       Why are you walking to and fro in the room ?  
 Person2:I ’ m worrying about the children . After all this is the first time they have been out without us .  
 Person1:        Don ’ t worry . They are grown-ups .  
 Person2:I know . But I couldn ’ t help . 

formal