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: Hi,. 
 agent: Hello, how can I assist you now? 
 customer: Please book a ticket from Houston, TX-HOU to New York, NY-LGA. 
 agent: Sure, please share me your planned journey dates? 
 customer: Departure is on 03/05 and 03/07 is my return date. 
 agent: Please mention your connection limit? 
 customer: Connections limit is 1. 
 agent: Please wait for a moment. 
 customer: Sure. 
 agent: Thanks for waiting, there is a connecting flight of airline Frontier, flight number is 1015 and fare is 100,. Shall I proceed with booking? 
 customer: Please book a ticket. 
 agent: Your booking has been done. 
 customer: I am Michelle Adams. Thanks.
Output:
book