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 hear you and James are engaged at last . 
 Person2:Yes , we are . 
 Person1:        When are you getting married ? 
 Person2:In the spring . 
 Person1:        Oh , lovely.Where ' s the wedding going to be ? 
 Person2:Well .. we're not sure yet , probably in St.Albans . 
 Person1:        Oh , yes , your parents live there , don't they ? 
 Person2:Yes , that's right . 
 Person1:        Where are you going to live after you're married ? 
 Person2:We're going to buy a flat or a small house somewhere in South London . 
 Person1:        Are you going to give up your job ? 
 Person2:Yes , probably but I may look for another one when we're settled in . 

informal