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 kind of permanent would you like to have ?  
 Person2:What kinds do you have ?  
 Person1:        Oh , we have quite a regular , cold perm , straight perm , pin curl and foam .  
 Person2:Last time I tried a pin curl perm and a foam permanent . Set the wave a little looser than usual , please . 

formal