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:       Hello , I'm Jack . Are you Christina ?  
 Person2:Yes I am . Nice to meet you , Jack .  
 Person1:        Are you from Italy , Christina ?  
 Person2:No , I am German . I live in Munich .  
 Person1:        Really , I went to Munich last week .  
 Person2:And did you like it ?  
 Person1:        Oh , yes . It is a fantastic city . And I like German food as well .  
 Person2:And where are you from , Jack ?  
 Person1:        I am from California in the United States . But I am now studying in England .  
 Person2:What are you studying ?  
 Person1:        I am studying languages . This year I am doing German and Italian .  
 Person2:Oh , excellent . Why don't we talk in German for a while then ? 

informal