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:       Hi ! Wang Mei.Come and have a look at my new dress .  
 Person2:Oh ! What a beautiful dress ! It fits you so well.You look so charming in the dress .  
 Person1:        Thank you for saying so .  
 Person2:Where did you buy it ?  
 Person1:        I bought it in a store near my school .  
 Person2:How much is it ?  
 Person1:        It's only thirty yuan .  
 Person2:It's so cheap . I'll buy one , too .  
 Person1:        I'll go together with you . 

informal