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:       So what did you get ?  
 Person2:It's all in the bag .  
 Person1:        What's this ? Essential oil ? Wow ! This stuff is expensive .  
 Person2:I need that to relax . I'm going to put a few drops in my bath water .  
 Person1:        How is oil supposed to make you relax ?  
 Person2:They all have essence of flowers in them .  
 Person1:        Mmmm . They smell nice . 

informal