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 often between 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 thunderstorms every day usually in the afternoon . i heard your city has a lot of fog , is that true ?  
 Person1:        We do have a few foggy days in winter.but i would not say we have a lot of fogs.the sky are usually clearly over your city , are they ?  
 Person2:Yes , they are . like i said we have thunderstorms.but each one usually only 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 only see it outside of our city .  
 Person1:        The river in my city sometime freeze over.people go ice-skating on it.on 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 in sunny . 

formal