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 would like to have a custom-made skirt .  
 Person2:May I take your size ?  
 Person1:        OK . I want it a bit close around the waist .  
 Person2:No problem .  
 Person1:        How long will it take ?  
 Person2:About a week .  
 Person1:        What ’ s the charge for the tailoring ?  
 Person2:20 yuan for a skirt . 

formal