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:       Is there anything I can do for you ? 
 Person2:Yes . I have reserved a table for 2 at 7:30 . My name is Bob . 
 Person1:        Yes , sir . Is there anything wrong ? 
 Person2:Three of our friends will join us so can you seat 5 people at that time ? 
 Person1:        No problem , sir . We will arrange you a table for 5 . 
 Person2:Thank you . 

informal