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:       Now darling , I know that we've bought this house together , but it's just going to be far too expensive to decorate it . I think we should sell it .  
 Person2:Oh , no , Nathan , I ... I really think we've bought this flat at the right time , you know . Market prices are going to go up , and I think you'll find in a year or two it will be worth a lot more .  
 Person1:        But we're going to spend so much money in furnishing and decorating . I think we could get a much cheaper place that's already furnished .  
 Person2:But don't you like this place ? I remember when we came to see it we thought it would be lovely .  
 Person1:        Well , only you liked it really , darling .  
 Person2:Oh , why didn't you say so then ? But I still think we've made a good buy . 

formal