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:       Hello , Catherine . Would you like to go out tomorrow ?  
 Person2:Tomorrow ?  
 Person1:        Yeah , I was thinking we could get a bite to eat and catch a movie .  
 Person2:That sounds great .  
 Person1:        Yes . We can do something else if you like .  
 Person2:OK . Dinner and a movie will be perfect .  
 Person1:        Well . What time would you like me to pick you up ?  
 Person2:How about 7 o'clock ?  
 Person1:        Good . I will see you then .  
 Person2:OK . Bye .  
 Person1:        Bye . 

informal