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:       I want to buy some jewellery .  
 Person2:What kind of jewellery do you like to have ?  
 Person1:        I should like to look at some bracelets .  
 Person2:May I show you gold ones or platinum ones ?  
 Person1:        Gold ones .  
 Person2:Pure gold or carats ?  
 Person1:        Pure gold ones , please . This is so beautiful . I'll take it .  
 Person2:OK .  
 Person1:        How much is it ?  
 Person2:1336 yuan . 

informal