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:       Do you like traveling ?  
 Person2:Yes , I've just come back from Scotland .  
 Person1:        Where did you visit ?  
 Person2:I only had time to visit Edinburgh .  
 Person1:        How did you like it ?  
 Person2:It's fantastic .  
 Person1:        Why did you go there ?  
 Person2:I went there on business .  
 Person1:        And do you have friends there ?  
 Person2:Yes , a lot of friends .  
 Person1:        You must have enjoyed yourself .  
 Person2:Yes , and I look many pictures . 

informal