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:       Good morning !  
 Person2:Can I speak to Miss Cooper please ?  
 Person1:        Would you hold on a second , please ? Miss Cooper's extension is engaged .  
 Person2:Engaged.Oh , dear ! Could you tell her it's a long-distance call ?  
 Person1:        I'm sorry , sir . I can't interrupt her . I'm sure she won't be very long .  
 Person2:How long do you think she'll be ?  
 Person1:        I really can't say how long she'll be .  
 Person2:Can I leave a message , please ?  
 Person1:        Yes , certainly .  
 Person2:Can you tell her I'm waiting to speak to her ?  
 Person1:        Yes , sir . I'll ring her on an inside line if you like .  
 Person2:Thank you very much . 

informal