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:       Do you think it's time to sign the contract , Mr . Simpson ? 
 Person2:I'd like to look it over before I sign it . 
 Person1:        OK , no problem . I hope there are no questions about the terms . 
 Person2:I am fully satisfied with the terms of this contract . 
 Person1:        Shall we sign this contract now ? 
 Person2:OK . Where do you want me to sign ? 
 Person1:        Just sign at the bottom . 
 Person2:OK . ( Sign ) Once a contract is signed , it has legal effect . 
 Person1:        You're right . Thank you for your cooperation . 
 Person2:It's my pleasure . 

informal