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:       Excuse me . Do you know where I can find the nearest ICCC ?  
 Person2:Yes , but it's quite a ways .  
 Person1:        Do I need to take a bus ?  
 Person2:This bus doesn't take you directly there . You'd have to change buses twice . I suggest you walk . It'll take you less than 20 minutes .  
 Person1:        How do I get there on foot ?  
 Person2:Go straight ahead through the intersection .  
 Person1:        Wait , let me write this down ... Alright , I'm ready .  
 Person2:Keep walking till you pass the square , then turn right . Walk past two lights and turn left at the third .  
 Person1:        Square ... turn right ... traffic lights ... And then ?  
 Person2:Keep walking and look for a tall building .  
 Person1:        Tall building ... Which side is the building on ?  
 Person2:The right side . ICCC should be on the first floor .  
 Person1:        Thank you very much .  
 Person2:You're welcome . 

informal