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. I am Susan Jackson. 
 agent: Hello, how can I provide assistance for you? 
 customer: As I am racer, I want to attend for horse racing festival which is going to held at San Francisco, SFO. 
 agent: Ok. 
 customer: Can you please book a ticket from New York, LGA? 
 agent: Sure, I am perky to help you. 
 customer: Thank you. 
 agent: Let me know, when you are planning to depart? 
 customer: I want to start my journey on 10/16. 
 agent: Do you need a lay by in between your journey? 
 customer: I need a connecting flight. 
 agent: Kindly, share your return date of journey to proceed further. 
 customer: I will return back on 10/18. 
 agent: Thank you for sharing your details. Please, wait for a while. 
 customer: Sure. 
 agent: Thank you for being patience, there is a flight available in Southwest airline, flight number 1001 having fare 200 and a lay by. 
 customer: You can proceed. 
 agent: Your reservation has been processed. 
 customer: Thank you. 
 agent: Thank you for availing us.
book