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:       Daddy , how are you going to spend your weekends ?  
 Person2:I need to finish my research paper .  
 Person1:        Could you go with me to climb Kiang Shan ?  
 Person2:Honey , I am sorry I have no time .  
 Person1:        Oh , Daddy , you should do more exercise . You are getting a little heavy .  
 Person2:I am afraid you are right . Recently , even going upstairs makes me out of breath .  
 Person1:        Then go climbing with me , Daddy . Mountain climbing can build your muscles like Popeyes .  
 Person2:Terrific ! It is also a good exercise to keep me fit .  
 Person1:        I give you my word , you must feel refreshed after mountain climbing .  
 Person2:OK , I'll go .  
 Person1:        That's a deal .  
 Person2:Sure . 

formal