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:       Are you busy next Saturday ? 
 Person2:No , why ? 
 Person1:        I need to get a costume for a fancy dress party , and I reply don't know what to get . Will you come shopping with me ? 
 Person2:Sure I like shopping . Who is organizing the party ? 
 Person1:        One of the girls in my office . 
 Person2:What's the occasion ? 
 Person1:        There is no specie occasion . She just likes to organize parties from time to time . This time it is a country theme . 
 Person2:That's easy , how about a cowgirl ? Oh I know even better , a Canadian Mountie . 
 Person1:        Well where am I going to get that sort of costume ? 
 Person2:Leave it to me . I know exactly where to find it . 
 Person1:        Oh good . 
 Person2:Excellent , come over at ten o'clock and we will start at the shopping center , the one around the corner from my house . They have just the shop we need . 

informal