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 . May I help you ?  
 Person2:Yes , I'd like to rent a car .  
 Person1:        What kind of car do you have in mind ?  
 Person2:An automatic sedan .  
 Person1:        I see . How long will you need it ?  
 Person2:About a week .  
 Person1:        Just a moment , please . 

formal