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:       Hello , John , please invite all our clients to the conference next week .  
 Person2:How should I get their contact info .  
 Person1:        Get the clients ' contact info from my Rolodex .  
 Person2:Where should I put them up ?  
 Person1:        How about the Holiday Inn ?  
 Person2:The clients like the Shangri-La Hotel more .  
 Person1:        Well , the client is always right .  
 Person2:What else would I prepare , Sir ?  
 Person1:        Please print out the meeting agenda for me to look over .  
 Person2:Certainly .  
 Person1:        And make sure to return my Rolodex to my desk when you are done with it .  
 Person2:Of course . I'm on it 

formal