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:       Excuse me , what do you want for this bag ?  
 Person2:Let me see . That one goes for $ 17 .  
 Person1:        Would you take $ 12 ?  
 Person2:No , I can ’ t give it to you , let you have it for 12 . How about 14 ?  
 Person1:        13.50 ?  
 Person2:Sorry , $ 14 is the lowest I can go . 

informal