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:       Hey , Jack , I'd better go now . 
 Person2:Is your boss coming by ? 
 Person1:        Right ! And I have to finish the report by 5:30 p . m . 
 Person2:Okay . Get back to your work , and call me back this evening . 
 Person1:        Okay , no problem . Bye ! 
 Person2:Bye ! 

formal