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:       This is my house.Let me show you around it .  
 Person2:How beautiful the detached house is !  
 Person1:        Follow me to the back-yard .  
 Person2:It's marvelous ! The lawn looks like a green carpet , and the garden with so many lovely flowers .  
 Person1:        We had the grass cut and the flowers trimmed this morning .  
 Person2:No wonder it smells fragrant .  
 Person1:        Here is the swimming pool and we can swim later .  
 Person2:It's fantastic ! 

informal