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 assist you today? 
 customer: I am Kenneth Anderson. 
 agent: Nice to meet you. 
 customer: I want to book a flight ticket from ATL to LAS, can you help me in booking? 
 agent: Sure, please provide your travelling dates. 
 customer: I am planning my trip dates on 08/22 and 08/24. 
 agent: There is a flight with price 100 and the connections 1 is available. 
 customer: Yes, you can confirm my ticket booking. 
 agent: Your ticket is booked. The flight number is 1022. 
 customer: Thank you for your help in my ticket booking. 
 agent: Welcome, have a great day.
book