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 know , Mary , I feel we meet somewhere before . Where were you born ?  
 Person2:I was born in Beijing , but I spent most of my childhood in London .  
 Person1:        What was your childhood like ?  
 Person2:I had a pretty strict upbringing , and my parents taught at an university so they have extremely high expectations for me .  
 Person1:        Where did you go to university ?  
 Person2:My parents wanted me to stay in Beijing , but I decided to go back to England . I graduated from University of Newcastle upon Tyne with a degree in Cross Culture Communication .  
 Person1:        What is your current occupation ?  
 Person2:I am a journalist . I write for China Daily . 

formal