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:       Hey , Robert , that's a nice shirt you are wearing . Where did you get it ?  
 Person2:Thanks , I like it too . I bought it at the nearby department store .  
 Person1:        That's nice . Do you know you can get one at the wholesale market near the zoo for a much lower price ?  
 Person2:Yeah , I know that . But at those places . the prices they ask you are ridiculously high , and if you don't bargain hard , you will get ripped-off .  
 Person1:        True , learning how to haggle the price is one of the things people have to pick up when they come to China for the first time .  
 Person2:Yeah , but personally I hate bargaining . If I bargain , I might come to a lower price . But I will never know the true price of what I am buying , and I'll always have the feeling that I am over charged at those places .  
 Person1:        Yeah , I have the same feeling . Also there is another thing that bothers me the quality . Things in a department store are usually quality-guaranteed . But at a wholesale market , you never know whether what you are buying are of good quality or not .  
 Person2:That's why I like department stores more . Shopping at a wholesale market like the locals is one of the few things I am unable to grow accustomed to .  
 Person1:        I understand . While it's always good to follow the local customs , I guess there are exceptions . 

informal