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 , look at my new shirt . What do you think about it ?  
 Person2:Just so-so . Where did you get it ?  
 Person1:        I bought it on a street market . A real bargain !  
 Person2:I'd much rather buy expensive but good quality clothing , because it is not only nice but lasts a long time . 

formal