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:       I plan to buy a car this year .  
 Person2:How do you pay for it ?  
 Person1:        I'm going to work in holidays and pay by installments .  
 Person2:Tell me if you need help . 

formal