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'.

Q: 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 .

A: informal
****
Q: Person1: Oh , what a pleasant surprise ! Don't you remember me ?
Person2:Mr.Black , if I'm not mistaken .
Person1: Right ! Glad to see you here .
Person2:Pleased to see you.too .

A: informal
****
Q: Person1: Hello , Jack ! Fancy meeting you here !
Person2:Yes , it's really a surprise . How are you ?
Person1: Fine . How is Jim ?
Person2:Oh , he is all right . But busy as usual . Well , why don't we have a good chat at a bar ? It's been long time since we met each other last time .
Person1: Good idea !

A:
informal
****