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 rent a formal suit here.Do you have a purple dress here ?  
 Person2:Yes . What size are you ?  
 Person1:        I am a size 6 .  
 Person2:Try this on please .  
 Person1:        This is just my size . How much is the rent  
 Person2:The rent is 400 yuan a day . 

formal