Given the task definition and input, reply with output. 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: Hello. 
 agent: Hello. How can I help you? 
 customer: I am Elizabeth Anderson. I am planning to visit Magic Kingdom at Orlando, could you please help me with booking a flight ticket from LAS to MCO? 
 agent: Yes, I can help you. Can you share me your travelling dates? 
 customer: I would like to take off on 05/27 and return on 05/29. 
 agent: Give me a moment. 
 customer: Sure, take your time. 
 agent: I have found a flight ticket with a price of 100 and 1 connection. 
 customer: Please confirm the booking. 
 agent: Ok, your ticket is booked. 
 customer: I really appreciate your help, thank you for your service. 
 agent: Thank you for contacting us.
book