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:       Say , Jim , how about going for a few beers after dinner ? 
 Person2:You know that is tempting but is really not good for our fitness . 
 Person1:        What do you mean ? It will help us to relax . 
 Person2:Do you really think so ? I don't . It will just make us fat and act silly . Remember last time ? 
 Person1:        I guess you are right . But what shall we do ? I don't feel like sitting at home . 
 Person2:I suggest a walk over to the gym where we can play singsong and meet some of our friends . 
 Person1:        That's a good idea . I hear Mary and Sally often go there to play singsong . Perhaps we can make a foursome with them . 
 Person2:Sounds great to me ! If they are willing , we could ask them to go dancing with us . That is excellent exercise and fun , too . 
 Person1:        Good . Let's go now . 
 Person2:All right . 

informal