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:       So how far is the museum , dad ? 
 Person2:It is about 10 minutes walk . 
 Person1:        Finish your hot chocolate and we will go . 
 Person2:Are we going to come back here for lunch ? 
 Person1:        No , we will have lunch at the museum cafeteria . 
 Person2:I have finished . We can go now . 
 Person1:        Let's go then . On the way we have to turn right and right again at the next junction . 
 Person2:Let's stop at the newsagent , I would like to buy a newspaper . We can also buy postcards for your friends . 
 Person1:        Can you see a Post Office somewhere around here ? 
 Person2:Yes it is down there , at the end of the road , next to the supermarket . 
 Person1:        Oh good we are almost there . The museum is round the corner from the Post Office . 

formal