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:       Which is more interesting to you , flying kites or going roller-skating ?  
 Person2:Well , flying kites is more fun to me .  
 Person1:        I've got no kite . Do you have one ?  
 Person2:Let's go and buy one . 

formal