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:       A funny thing happened to me the other day . 
 Person2:Oh , yes ? 
 Person1:        I was just thinking about someone I went to school with , this boy I was quite friendly with in third grade . We used to hang out together - he lived next door - but then my parents moved and I changed schools and never saw him again . 
 Person2:Mmm . 
 Person1:        Well , I was walking down Nan Jing Dong Lu ( Nan-Jing E . Rd . ) during my lunch break thinking about this boy-I have no idea why I was thinking about him . 
 Person2:Really ? 
 Person1:        Yes . And suddenly I heard someone call my name . I turned around and there was this man looking at me . I didn't recognize him at all , but he obviously knew who I was . 
 Person2:Oh , yeah , that's embarrassing when that happens . 
 Person1:        You got it . Well , he walked up to me and said my name again and then I realized it was the boy I had been thinking about , the one from third grade ! 

informal