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 , may I speak to Mr.Baker , please ? 
 Person2:Hold on a second , please . I'll see if he's in . I'm sorry , Mr.Baker had just gone out . Who's calling ? 
 Person1:        This is Jones . Can I leave a message ? 
 Person2:Yes , certainly . What's that ? 
 Person1:        Please tell him to call Mr.Baker at the Grand Restaurant . It's urgent . 
 Person2:OK , I'll have Mr.Baker call you as soon as he comes back . 
 Person1:        Thank you . 
 Person2:You're welcome . 

formal