Instructions: 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. 
 customer: I am Jack Gonzalez. 
 agent: How can I aid you at this moment? 
 customer: I have to attend a Live Concert at Atlanta, could you please help me with booking a flight ticket from DEN to ATL? 
 agent: Sure, I am happy to aid you in booking flight ticket. Could you please let me know your travel dates for booking flight ticket? 
 customer: I would like to take off on 08/04 and return on 08/06. 
 agent: Please hold on a moment, I will check flight availability in this route. 
 customer: Sure, take your time. 
 agent: Thank you for waiting. Based on your information, I have found a flight with 1 connection with the fare of 200 provided by UA airlines. Is it ok for you? 
 customer: Please confirm the booking. 
 agent: Your flight ticket is booked successfully, flight number is 1007. 
 customer: I really appreciate your help, thank you for your service. 
 agent: You are welcome Jack Gonzalez.
Output:
book