Definition: In this task, you are given a conversation between a flight agent and the customer. You are given 4 options and you need to select the goal of the conversation. It is provided as part of customer's context, which has to be one of the following: `book`: Make a new reservation, `cancel`: Cancel an existing reservation, `no_flight`: No flight found for the customer's preference, `no_reservation`: No reservation / No change / No cancellation was made in the conversation, mostly enquiring details
Input: customer: Hello. 
 agent: Hello, how can I serve you? 
 customer: I am planning to book a ticket from ORD to OAK. Can you please help me out? 
 agent: Sure, may I know your planned travel dates? 
 customer: I am planning to travel on Nov 14 and return back on Nov 16. 
 agent: Do you have any class preference? 
 customer: Yes, I am looking for a economy class. 
 agent: May I know your connection limit? 
 customer: I am looking for a connecting flight. 
 agent: Is there any other preference do you have? 
 customer: No. 
 agent: May I know your name please? 
 customer: I am Susan Perez. 
 agent: We have a direct flight from American airlines, number 1006 and the price is 100. Shall I proceed with it? 
 customer: That's fine, please proceed the booking. 
 agent: Your ticket has been confirmed in economy class. 
 customer: Thank you for your service. 
 agent: Thank you for reaching us.
Output:
book