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 , Green here .  
 Person2:Oh , Mr Green , my name is Jianshan . You don't know me , but I'm a friend of David Smith .  
 Person1:        Oh , yes .  
 Person2:When I told David I was coming here to live , he give me your number , and suggest that I give your a ring . I was wondering if you could give me some advices .  
 Person1:        I'll be please to if I can . What can I do for you ?  
 Person2:Well , I'm looking for a place to live . David thought as you are a @ agent . you might know something is suitable .  
 Person1:        Yes , I think I can help you . Why not you come around and see me ? Do you know my office ?  
 Person2:Yes , I've got the address .  
 Person1:        Good , where are you now ?  
 Person2:I'm at the post office .  
 Person1:        oh , well , that's just a few minutes walk to my office , come around and see me now .  
 Person2:Thank you very much , Mr Green .  
 Person1:        Not at all . 

informal