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'.

Example Input: Person1: Excuse me , I bought this sweater yesterday . But when I got home and tried it on , I found it ' s too small .
Person2:Do you have the receipt with you ?
Person1: Yes , here you are .
Person2:Thank you . Do you want your money back ?
Person1: No , can I exchange it for a bigger one ?
Person2:I am afraid this is the biggest size we have .
Person1: Oh , that's too bad .
Person2:Maybe you would like to try this one with the willow pattern . The price is the same and it's bigger .
Example Output: formal

Example Input: Person1: Before we begin eating , I'd like to present everyone with a gift from Taiwan .
Person2:What is it ?
Person1: It's a Taiwanese puppet doll .
Person2:It's huge !
Person1: Yeah . They're usually this big .
Person2:The craftsmanship is excellent .
Person1: All the parts work .
Person2:Thank you so much .
Person1: Don't mention it .
Example Output: informal

Example Input: Person1: Do you like shopping at flea markets ?
Person2:l love it . There is always something fascinating to discover .
Person1: The antiques market here in Paris is very famous . It's called Le marche aux puces de Saint-Ouen .
Person2:That's not very easy to say .
Person1: It's also known as Les Puces , which means ' The Fleas ' .
Person2:Can you find many bargains there ?
Person1: Well , it really depends . Because you are a tourist , it might be harder for you to get really good prices .
Example Output:
informal