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:       Dad , where are we off to ?  
 Person2:First we will go to the city centre and stop for something to drink . Then we will visit the University Museum .  
 Person1:        Where are we going to have a drink ?  
 Person2:There is a coffee shop round the corner . Can you see that big building at the end of the road ?  
 Person1:        Yes ?  
 Person2:That is a bank . The coffee shop is opposite the bank .  
 Person1:        Good . I will have hot chocolate .  
 Person2:A stop ! Wait for the lights to turn green .  
 Person1:        When crossing the road you must always pay attention to what's around you .  
 Person2:Sorry . How far is the museum ?  
 Person1:        I am not sure . We will ask for directions in the coffee shop .  
 Person2:Here we are . You find us a table and I'll get the drinks . 

formal