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 like double-breasted garment with no belt.Could you show me some ?  
 Person2:Here you are.Which size do you wear ?  
 Person1:        Medium.May I try it on ?  
 Person2:Of course.You look terrific in it ! 

informal