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 . Is Bob there , please ?  
 Person2:Hold on a second please . I'm sorry . He has gone out .  
 Person1:        Oh . This is Paul . When will he be back ?  
 Person2:He will be back at about seven o'clock .  
 Person1:        Can I leave a message please ?  
 Person2:Yes , certainly .  
 Person1:        Please tell him I'll call him at the office tomorrow afternoon .  
 Person2:All right . I'll tell him when he comes back .  
 Person1:        Thank you very much . 

informal