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:       Rebecca Johnson speaking .  
 Person2:I'd like to speak to someone in your Accounts Department , please .  
 Person1:        Just a moment ... I'm afraid there's nobody there right now . Could I take a message ?  
 Person2:Yes , please . My name's Michael Caxton from one of your customers — Rosedale Investments .  
 Person1:        Sorry , just a moment . The name is Caxton ...  
 Person2:No , it's Caxton .  
 Person1:        Fine , I've got that . And your company is ...  
 Person2:Rosedale Investments .  
 Person1:        Could you spell that , please ?  
 Person2:It's R , O , S , E , D , A , L , E .  
 Person1:        Thank you . And the message ?  
 Person2:It's about an invoice which is wrong .  
 Person1:        Have you got the number there ?  
 Person2:Um ... yes ... it's 856674 / ros .  
 Person1:        856674 .  
 Person2:That's right .  
 Person1:        OK , I'll get someone to phone you first thing in the morning .  
 Person2:Thank you very much . 

formal