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 that Mr . Li ?  
 Person2:Yes , speaking . What can I do for you ?  
 Person1:        I am calling to check your information before the interview . What position did you apply ?  
 Person2:I am applying for the waiter in your pub .  
 Person1:        Excuse me . Could you slow down a little ? I couldn't catch you .  
 Person2:Sure . I will try my best to slow down . 

formal