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:       Hi , Francis .  
 Person2:Oh , Mike . How are you doing ?  
 Person1:        Not bad . It seems you are super yogurt lover . You have so many in your cart .  
 Person2:Well , I prefer yogurt to all the other drinks . Have you ever tried a kind of yogurt with old milk in it ? It tastes great and very healthy too .  
 Person1:        Oh , I haven ’ t noticed that before . Maybe I will try next time .  
 Person2:Why don ’ t you go ahead of me ? I have more items than you .  
 Person1:        Thank you . In fact , I am in a hurry . My wife is waiting for me at the parking lot .  
 Person2:You ’ re welcome . It was good seeing you again .  
 Person1:        Me too . Have a great day . 

informal