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 did you cook ? 
 Person2:Well , as you know I was in Thailand last month , and I took a cooking class ! So I prepared some of my favorite dishes . 
 Person1:        Great idea ! As long as I don't get food poisoning ! So what is on the menu tonight ? 
 Person2:Ok , for starters we have Tom Yam soup . It's a bit spicy , but really good ! 
 Person1:        This is delicious ! The ginger and lemongrass really gives it a nice taste ! 
 Person2:Now this next dish is one of the most famous . Foreigners call it papaya salad but the proper name is Tom Sam . It is a spicy salad made from a mix of fresh vegetables including shredded unripened papaya and tomato . 
 Person1:        This is delicious ! The combination of sour and spicy is really interesting ! I could have this everyday ! 
 Person2:Ok , now for the last and best dish in my opinion . This is called Pad Thai . It's stir-fried noodles with eggs , fish sauce , tamarind juice , red chili pepper plus bean sprouts , shrimp and tofu and garnished with crushed peanuts and coriander . It's practically Thailand's national dish ! 
 Person1:        Wow , this is great ! I never knew Thai food was so creative and delicious ! 
 Person2:Want some more ? 
 Person1:        I'm stuffed ! 

informal