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:       What can I do for you , Miss ?  
 Person2:I want to buy a bottle of perfume for myself .  
 Person1:        Well , here is a perfume kind for women .  
 Person2:I don't like strong perfumes .  
 Person1:        How about this Isawell's flowery perfume ?  
 Person2:I don't think it smells nice .  
 Person1:        Do you have green tea perfume ?  
 Person2:Yes , here you are .  
 Person1:        May I have a look at this ?  
 Person2:Sure . The bittersweet perfume has a calming effect on the nerves .  
 Person1:        I like this fragrance .  
 Person2:How much is it ?  
 Person1:        150 yuan .  
 Person2:I'll take it . 

informal