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:       You look like being on cloud nine .  
 Person2:I am .  
 Person1:        What has made you so happy ?  
 Person2:I think I'm in love .  
 Person1:        Are you ? Who's the lucky girl ?  
 Person2:Her name is Jenny .  
 Person1:        How did you meet her ?  
 Person2:We are in the same math class . Our teacher sat us next to each other .  
 Person1:        What do you like best about her ?  
 Person2:She's very funny . She makes me laugh all the time .  
 Person1:        I guess it was fate working to bring you together .  
 Person2:Whatever brought us together , I'm happy . 

informal