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:       Professor , where's Canada ?  
 Person2:Canada is north of here .  
 Person1:        Can you show me on the map ?  
 Person2:Sure . Look here . Canada is north of the United States .  
 Person1:        Oh , I see . Where's Mexico ?  
 Person2:Mexico is south of the United States .  
 Person1:        How about Connecticut ? Where's that ?  
 Person2:Connecticut is east of New York .  
 Person1:        What state is west of Pennsylvania ?  
 Person2:Ohio .  
 Person1:        OK , Where's Los Angeles ?  
 Person2:Los Angeles is in California . It's southeast of San Francisco .  
 Person1:        Where's Boston .  
 Person2:Boston is in the northeast part of the country .  
 Person1:        Where is Las Vegas ?  
 Person2:Las Vegas is in the southwest . 

formal