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:       I want to change rooms . In fact , I want a refund for tonight ! 
 Person2:And the problem is , sir ? 
 Person1:        Cockroaches have taken over my room ! 
 Person2:My apologies , sir . We'll give you a new room and refund the value of your current room . 
 Person1:        Thank you . I want to continue to be able to recommend this hotel to others . 
 Person2:We always try to serve our guests in the most agreeable way possible . 

formal