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 evening . Welcome to our restaurant . 
 Person2:Good evening . We want a dinning room with a table for eight . 
 Person1:        I'm sorry , sir . The rooms are not available now . But would you like to have your dinner in the dinning hall ? I can find a table by the window for you . 
 Person2:No , thanks . We have made a reservation before . 
 Person1:        Can I have your name , please ? 
 Person2:My name is James . 
 Person1:        I'll ask waitress to show you the way . 
 Person2:Thanks . 

informal