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:       Is there a city where it's always warm ? 
 Person2:Yes , there are many cities where it's almost always warm.San Diego , for example . 
 Person1:        Are there any other cities where it's always hot ? 
 Person2:Many.Most of the cities in the southern part of the United States are hot all year . 
 Person1:        But why do so many people live there ? 
 Person2:Most people grow accustomed to the climate , but there are many others who complain about it all the time . 
 Person1:        Are there any cities where it rains a lot ? 
 Person2:Several.Two good examples are Seattle , in the state of Washington , and Portland , Oregon . 
 Person1:        Tell us about some cold cities . 
 Person2:In the north there are many cities which are very cold in the winter.Boston and Chicago are two of them . 
 Person1:        Is it always cold in Chicago and Boston ? 
 Person2:Oh , no.On the contrary , there are many beautiful days , especially in the spring and fall . 

formal