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:       Do I have to deposit my handbag at the checkroom ?  
 Person2:No , you do not have to . The handbag can be taken with you . There is the cart at the entrance .  
 Person1:        Thank you . I'd tike to buy some milk powder for my baby . Is there anything that you can recommend for me ?  
 Person2:Well , how old is your baby ?  
 Person1:        No more than three .  
 Person2:The milk powder on the second level of the shelf is for the kids from 2 ages to 4 ages . I advice that you should buy the Wyeth brand , the source of milk is imported from New Zealand .  
 Person1:        How about its quality ?  
 Person2:You can be assured of it . There are various nutritions which are beneficial for the growth of babies ' bone and cerebrum .  
 Person1:        OK , what is this ?  
 Person2:It is feeding-bottle as the free gift .  
 Person1:        It is thoughtful . I will take it . 

informal