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:       Are there many idioms in English ? 
 Person2:There are hundreds and hundreds.English is particularly rich in idiomatic expressions . 
 Person1:        Can you give us an example ? 
 Person2:I'll look up the rate.To look up doesn't mean to look high into the sky or to look at the roof.It means to search for and find some information . 
 Person1:        What about the expression goodbye ? Is that an idiom ? 
 Person2:That is just a natural , grammatical English expression.It has a direct translation in other languages . 
 Person1:        This is interesting , Ms.Parker . 

informal