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:       What color is your new dress ?  
 Person2:It is green . Come upstairs and see it .  
 Person1:        Thanks you .  
 Person2:Look ! Here it is !  
 Person1:        That ’ s a nice dress . It ’ s very smart .  
 Person2:My hat ’ s new , too .  
 Person1:        What color is it ?  
 Person2:It ’ s the same color . It ’ s green , too .  
 Person1:        That ’ s a lovely hat . 

informal