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: Hi. 
 agent: Hello, how may I help you? 
 customer: Can you please book a flight ticket on dates June 14 and June 16? 
 agent: Sure, what are your airport codes please let me know? 
 customer: My airport codes are DEN and SFO. 
 agent: Do you have any preferences? 
 customer: I need a ticket in business class. 
 agent: May I know your name please? 
 customer: My name is Dennis Brown. 
 agent:  I have found a connecting flight with the fare of 900 provided by Frontier Airlines in business class. Are you ok with this flight? 
 customer: Yes, please book a ticket. 
 agent: Your flight ticket has been booked. 
 customer: Thank you. 
 agent: Flight number, 1010. Thank you for reaching us. 
 customer: Ok.
Output:
book