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:       What a wonderful dinner ! 
 Person2:Thank you . I am glad that you are enjoying it . 
 Person1:        Where did you get your fantastic recipes ? 
 Person2:I grew up cooking . My mother shared her recipes with me . 
 Person1:        I especially like the wonderful chicken dish . 
 Person2:That is a special coconut ginger chicken with rice dish . 
 Person1:        Is that shrimp in the soup ? 
 Person2:Yes , do you like it ? I added a little extra lemon grass and some sea vegetables . 
 Person1:        I am happy that the wine I brought for you works well with this meal . 
 Person2:Yes , thank you for bringing the wine . It really complements the meal . 

informal