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:       Mister , I have an account now . 
 Person2:Now , how would you like this check cashed , madam ? 
 Person1:        Six tens will be fine . 
 Person2:Here you are . 
 Person1:        Thanks . Er , mister , if I want to deposit checks next time . what should I do ? 
 Person2:Just make out a deposit slip and come here during bank hours . That's from 9 a . m . to 3 p . m . 

formal