Given the task definition and input, reply with output. 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'.

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