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's the weather like in your city ?  
 Person2:In the summer it gets very hot . The temperature is between often 37 and 40 centigrade . When it is hot we often get rains . The winters are drier .  
 Person1:        The summer temperature usually often reaches about 20 or25 in my city . The rain falls mostly in the winter . And we often get snow .  
 Person2:What are the temperatures in winter ? In my city it is about 15 or 20 degrees .  
 Person1:        In winter temperature often falls to zero at night temperature can be below that . The streets are often icing in the morning . With high such temperatures you must get some thunderstorms .  
 Person2:Yeah , we do . In the middle of summer there can be found storms every day usually in the afternoon . I heard your city has a lot of fog , is that true ?  
 Person1:        We do have a few fog days in winter . But I would not say we have a lot of fogs . The sky are usually clearly in your city , are they ?  
 Person2:Yes , they are like I said we have thunderstorms . But each one usually last a few hours . Then the skys are clear again .  
 Person1:        Have you ever had snow in your city ?  
 Person2:My grandmother said there was snow once when she was a child . But my parents and I never see it outside of my city .  
 Person1:        The river in my city sometime freeze over . People go ice-skating on it . In summer people go boating on the river . But few people go swimming because it is not very clean .  
 Person2:As you know , my city is on the coast.the water is also not clean . But people still go swimming all year around . I prefer to sand bath on the beach when the weather is hot and sunning . 

formal