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:       Good afternoon , sir , is there anything I can do for you ?  
 Person2:Yes . I can't find my sweater . I have my laundry sent to you yesterday but when the washing is done . I find my swatter missing .  
 Person1:        Well , it's our fault.We are sorry for that.Would you please fill out the form ? We will pay for you .  
 Person2:That's fine . Maybe you should be more careful . 

informal