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 want to buy a wallet .  
 Person2:Here are all the wallets with various designs . How about this one ? It is quite fashionable .  
 Person1:        May I pick it up ?  
 Person2:Of course .  
 Person1:        Do you have one of better quality ?  
 Person2:This one is much better , but it is also much more expensive .  
 Person1:        There is no problem about the price . How much is it ?  
 Person2:Two hundred and thirty-five yuan .  
 Person1:        OK , I'll take it . 

formal