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:       Do you have shoes here ?  
 Person2:Yes . What do you want to buy ?  
 Person1:        I want to buy a pair of shoes for an interview .  
 Person2:What size do you wear ?  
 Person1:        My feet is size 37 . 

formal