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 morning . Mrs.Smith .  
 Person2:Good morning ! Can you help me , please ? I'm looking for some books for my mother .  
 Person1:        Well , what kind of books does she like ?  
 Person2:She's very fond of detective stories ?  
 Person1:        I see . Has she read any detective stories ?  
 Person2:Oh , yes !  
 Person1:        Do you know if she's read this one ?  
 Person2:I'm not sure , but she probably won't remember if she has ! She's very forgetful !  
 Person1:        Ah ! She has a bad memory . How old is she ?  
 Person2:She's eighty-seven .  
 Person1:        I suggest you take this book . It's very exciting .  
 Person2:Thank you . That's a good idea.she likes exciting books . Can you suggest another one ? 

informal