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:       Oh , hi , Lily . When did you get back from Canada ?  
 Person2:Just last week .  
 Person1:        How was it ?  
 Person2:Oh , I loved it . I only visited a couple of cities , you know . But I had a great time .  
 Person1:        Well , tell me . What are they like ?  
 Person2:They ’ re nice . 

informal