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 . 

formal