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:       How do you like Korea ?  
 Person2:I like it . It's a beautiful country .  
 Person1:        What part of the visit excited you most ?  
 Person2:The best island of Korea-Jizhou island .  
 Person1:        Why ?  
 Person2:Attractive scenery , pleasant climate , these make it charming .  
 Person1:        Yes , I think so . But there is also something terrible .  
 Person2:What do you mean ?  
 Person1:        Sometimes the traffic is too busy .  
 Person2:Yes , you are right . 

informal