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:       Hello , may I help you ?  
 Person2:Yes , I need some more cash for my visit in China . May I cash a traveler ’ s check here ?  
 Person1:        Of course . We would be happy to cash it for you .  
 Person2:I was going to cash it at the hotel , but one of my friends said that banks always give better exchange rates .  
 Person1:        Well , any bank will cash it at our present traveler's check buying rate , for which we ’ re somewhere cheaper than hotels because of the service charge . You see , hotels really aren ’ t in the money exchange business although they will cash traveler ’ s check for their guest .  
 Person2:You mean there is really not that much of a difference .  
 Person1:        No , madam . Not very much .  
 Person2:Well , may I cash these three checks for 100 dollars each ? I think that will be enough .  
 Person1:        Yes , I'll be happy to cash these for you . Would you please countersign them here ?  
 Person2:Ok . 

formal