Given the task definition and input, reply with output. 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'.

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