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 ’ d like to have this cashed , please .  
 Person2:Please put your name and address here . May I see your passport .  
 Person1:        Yes .  
 Person2:How would you like it ?  
 Person1:        Ten hundreds and Ten Twenties and the rest of small changes please .  
 Person2:Ok , here you are . 

formal