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 am Margaret Phillips. 
 agent: Hello, how may I support you today? 
 customer: I would like to attend a meeting with my client in Fisher Building at Detroit, DTW. Can you help me with booking a connecting flight ticket? 
 agent: Sure, may I know your source point? 
 customer: My source code is LGA. 
 agent: Ok, help me with your dates. 
 customer: My travelling dates are from 11/22 to 11/24. 
 agent: Ok, please hold on a minute. 
 customer: OK. 
 agent: Thanks for being on hold, there is a 1018 number flight with a fare of 100 in Spirit airlines. 
 customer: You can proceed with booking. 
 agent: Ok, your seat has been confirmed. 
 customer: Thank you for the help. 
 agent: Thank you for choosing us.
Output:
book