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:       At what age do children start school in your country ?  
 Person2:At five .  
 Person1:        Do boys and girls go to school together ?  
 Person2:Yes , they do .  
 Person1:        Do you think this is a good idea ?  
 Person2:Yes , I do .  
 Person1:        Do some children go on to university ?  
 Person2:Yes , they do .  
 Person1:        What examinations do they take first ?  
 Person2:O levels and A levels .  
 Person1:        How long do you usually stay at university ?  
 Person2:Three or four years . 

formal