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: Would you please teach me how to use the computer ?
Person2:Sure , let's take a look at the menu first .
Person1: Do I have to turn on the computer ?
Person2:yes , we can look at the computer and computer menu at the same time . And this will help us understand both better .
Person1: What should I learn first ?
Person2:Right now I'll teach you to open files , save files and copy files . Are you ready ?
Person1: I am ready I am going to get , let's start !
Example Output: informal

Example Input: Person1: But Sue is indeed beaut . Men can hardly resist such a knock-out .
Person2:Birds of feather flock together . You must be one of these men .
Person1: I know little of her . I only think she ' s pretty and intelligent . Of course , she ' s diligent , too .
Person2:That ' s enough for you to worship the ground she treats on .
Example Output: informal

Example Input: Person1: Did you hear about Bob and Mary ?
Person2:No , what happened ?
Person1: They had an argument and split up .
Person2:Really , what's going to happen now ?
Example Output:
informal