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:       Have you noticed the Mexican restaurant on the other side of this street ? 
 Person2:You mean the one with the yellow bricks ? But last time I saw it , it wasn ’ t really in business yet . I saw some people inside furnishing the rooms . Is it open now ? 
 Person1:        Yes , someone give me a pamphlet introducing the restaurant and its business hours when I passed by this morning.So , let ’ s have a try . My treat . 
 Person2:Great , I like the idea of trying some new food . 
 Person1:        Good for you . Today we have more chances to try some new food because there are now many new form restaurants in our city coming from places all over the world . 
 Person2:Also some traditional Chinese food , like noodles and dumpling are marketed in modern ways with improved food quality . I heard this year , the government has imposed very stringent inspection on the hygiene conditions restaurants and suppliers of food are also under tighter control . 
 Person1:        For sure all the customers will benefit from this . 

informal