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:       It seems that you are an optimistic man who doesn't dismay easily . That is what a good salesman needs . Good luck .  
 Person2:Thank you .  
 Person1:        I guess we have covered all the stuff that we need to discuss and it's time to say goodbye .  
 Person2:Yes , goodbye and keep in touch . 

informal