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:       Excuse me . Have you forgotten our drinks ? 
 Person2:Sorry , I'll bring them to you right away . 
 Person1:        Why is it taking so long ? 
 Person2:We are short of staff today . 
 Person1:        There is something wrong with this dish . 
 Person2:What's wrong ? 
 Person1:        I don't think this is fresh . 
 Person2:They were delivered this morning . 
 Person1:        Would you please ask the manager to come over ? 

formal