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 a great meal !  
 Person2:Thank you . I am glad that everything turned out so well .  
 Person1:        Who taught you how to cook this well ?  
 Person2:I took a cooking class at the Culinary Institute .  
 Person1:        Wow , what is in this chicken dish ?  
 Person2:Isn't that great ? That is coconut ginger chicken with rice .  
 Person1:        Is the soup a shrimp soup ?  
 Person2:Yes , there is shrimp in there along with sea vegetables and lemon grass .  
 Person1:        I think I got lucky in choosing a wine that blends with this meal .  
 Person2:I appreciate you bringing the wine . It goes well with the chicken . 

informal