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:       Did you go to see Michael last night ? 
 Person2:Yes , He had just bought a new motorcycle . 
 Person1:        Did he let you ride it ? 
 Person2:Yes , I tried it and I quite liked it . 
 Person1:        Weren ’ t you frightened ? 
 Person2:Sure . But I still liked it . 
 Person1:        Would you like to buy a motorcycle yourself ? 
 Person2:No . Although motorcycle is nice , I ’ d like to buy a bicycle . 
 Person1:        But why ? Since you like it so much . 
 Person2:Because bicycles are safer . 

informal