instruction:
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'.
question:
Person1: Can I help you , sir ?
Person2:I wish to buy a diamond ring .
Person1: How many carats would you like it to be ?
Person2:I want five carats .
Person1: Is this one suitable for you ?
Person2:No , it seems too old-fashioned to my fiancee .
Person1: What about this ?
Person2:It seems too small for me , haven't you got any larger ones ?
Person1: Then you can buy this one . It's very nice and latest in style .
Person2:Oh , this one is perfect .
answer:
informal

question:
Person1: Here's the picture of my family .
Person2:Can you point out your mother for me ?
Person1: OK.She ' s near-sighted , with a pair of glasses on her nose.She is the only one wearing glasses in my family .
answer:
formal

question:
Person1: Darling , I have news for you . Bobby and his wife , Evelyn , are going to have a baby soon .
Person2:Really ? I thought his wife couldn ' t have a baby .
Person1: Actually they ' re expecting the baby to come on my birthday .
Person2:Oh , what a coincidence ! I bet Bobby must be very happy about it . He likes children and always wants a child of his own .
Person1: In fact , they ' re both very excited about the coming baby . Evelyn imagines what their baby would be look like , since one parent is American and the other one is Chinese .
Person2:Oh , right . Now I know why they would want to see our boy . It ' s hard to imagine the wonder ! Are they expecting a boy or a girl ?
Person1: It ' s still a mystery . Because Evelyn is only three-month pregnant . But she begins to take her maternity leave now .
Person2:Oh ! You mean she doesn ' t have to work now ? It ' s hard for young parents not to overreact , isn ' t it ?
answer:
informal