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:       Excuse me . Is this the right way to the museum ?  
 Person2:I'm afraid you're going in the opposite direction . Go back the way you came , and take the second turn on the left . The museum is straight ahead , right in front of you .  
 Person1:        Will it take me long to get there ?  
 Person2:Well , it's about fifteen minutes ' walk .  
 Person1:        Which bus goes there ?  
 Person2:You may take a No . 34 bus . And the subway can also take you there .  
 Person1:        Thank you very much .  
 Person2:My pleasure . 

formal