You will be given a definition of a task first, then some input of the task.
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

customer: Hi, I am Joshua Phillips. 
 agent: Hello, how can I assist you? 
 customer: I have heard that Orlando is the best place for site seeing. So, can you book a flight ticket from Philadelphia, PA - PHL? 
 agent: Sure, we are here to help you. Can I have the exact airport code of Orlando? 
 customer: Sure, my destination code is FL - MCO. 
 agent: How much can you afford for this trip? 
 customer: I can afford up to 500. 
 agent: When are you planning to go Orlando? 
 customer: I want to travel on 07/19. 
 agent: Ok, do you need a stopover in between your route? 
 customer: Yes, I need a stopover. 
 agent: Please help me with your return date. 
 customer: My arrival date is on 07/21. 
 agent: Joshua, there is a flight from Frontier airline with fare 100 only. Shall I proceed with the booking? 
 customer: You may proceed if it is a connecting flight. 
 agent: Yes, it is a connecting flight. 
 customer: Thank you for your support, regarding flight booking process. 
 agent: Your reservation is confirmed with flight number 1005 on your name Joshua Phillips. Thank you for consulting us. 
 customer: Thank you.
Output:
book