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: Hello, I'm Laura Robinson. 
 agent: Hello, how may I assist you? 
 customer: I would like to go a hotel in New York, so could you please book a ticket? 
 agent: Please share your airport codes. 
 customer: My source and destination airport codes are HOU and LGA. 
 agent: Can you provide your dates of travel? 
 customer: I would like to travel on 11/04 and return back on 11/06. Ensure it is a single connecting flight. 
 agent: Please hold on for a while. 
 customer: Ok. 
 agent: There is a single connection flight available with Spirit airlines, shall I book it? 
 customer: Ok, please proceed for further. 
 agent: Your ticket is booked, flight number is 1000. 
 customer: Thank you. 
 agent: Thank you for reaching us, have a nice day.
Output:
book