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:       good afternoon ! Can I help you ?  
 Person2:could you show me where the Chinese-style clothing is located ? I want to buy a silk coat .  
 Person1:        this way , please . Here they are . They're all handmade .  
 Person2:oh , they look nice . May I try that back one on ?  
 Person1:        of course . The fitting room is right over there .  
 Person2:do you have a medium in the same color ? This one is a little tight .  
 Person1:        I'm sorry . All the back of that size are sold out . Would you like a red one ?  
 Person2:ok , let me try it on . what do you think ?  
 Person1:        oh , that suits you very well . Besides it is believed in China that the red color brings happiness and good luck .  
 Person2:really ? I'll take it , and I'm leaving here tomorrow . Is it possible for you to send one in black to me by mail when you gte it in ?  
 Person1:        our pleasure . Please fill out this form , leaving your address and telephone number .  
 Person2:thanks . Who much would that come to ?  
 Person1:        let me see ... 

informal