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:       would you like to learn to tango Donar ?  
 Person2:right now ?  
 Person1:        i am offering you my services . for your church . what do you say ?  
 Person2:i think i'll be a little afraid .  
 Person1:        of what ?  
 Person2:afraid of making a mistake .  
 Person1:        no mistakes in a tango Donar.not like life , simple , that will make the tango so great . if you make a mistake , you'll get all tango done . just tango along . why don't you try ? will you try it .  
 Person2:all right . i'll give it a try . 

informal