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: Hi, Andrew King here. 
 agent: Hello. How can I aid you today? 
 customer: I want to travel with my friends, can you please help me to book a ticket from DCA to DFW? 
 agent: Sure, I will help you Andrew King. Will you please inform your travel dates for booking flight ticket? 
 customer: Sure, my dates of planning is from 04/14 to 04/16. 
 agent: Ok, please wait a moment, I will check flight availability. 
 customer: Sure, please make sure that connection is 1. 
 agent: Sure. There is a flight ticket available as per your requested details, airline is Spirit and flight number is 1018. 
 customer: Please proceed with this booking. 
 agent: Ok. Your flight ticket is booked successfully. 
 customer: Thank you for your help in booking a ticket. 
 agent: Thank you for reaching us, have a good day Andrew King.
Output:
book