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:       Is this a photo of your family ?  
 Person2:Yes , it is.It was taken just before I was leaving for college .  
 Person1:        You look so lovely .  
 Person2:How time flies ! I'll not see twenty again . 

formal