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: Hi. 
 agent: Hello. How can I aid you? 
 customer: I am Alexander Moore. I want to participate in cultural events held at New York, NY - JFK. Can you please book a ticket with single connection? 
 agent: Sure, may I know the flying and landing dates? 
 customer: I would like to depart on 04/24 and return on 04/26. 
 agent: Is there any price limit? 
 customer: My origin is NY - LGA. Price limit is 1000. 
 agent: There is a flight in airline UA and number is 1029. The connection is as per your request. Can I proceed with booking? 
 customer: Please proceed. 
 agent: Your ticket is confirmed, happy journey. 
 customer: Thanks for your service. 
 agent: Thank you for choosing us.
book