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:       How many rooms are you looking for ? 
 Person2:Oh , four or five . How much is the rent for this apartment ? 
 Person1:        150 a month . 
 Person2:150 ? No , I'm not really interested in this place . It isn't big enough . It isn't near enough to my office . 

informal