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. 
 agent: Hello, how may I be at your service today? 
 customer: I want to travel from EWR to PHL, could you help me in reserving a ticket? 
 agent: Sure, I will help you in booking the ticket. May I know your travelling dates please? 
 customer: My journey dates are Dec 30 to 01. 
 agent: Do you have any other specifications? 
 customer: I prefer connecting flight. 
 agent: Please help me with your name for booking. 
 customer: I am Mark Turner. 
 agent: According to your information, I have found a  direct flight in your journey with a minimum fare of 200 with flight number 1005. Shall I proceed with this flight? 
 customer: Ok, please proceed with booking. 
 agent: Your booking is done. 
 customer: Thank you. 
 agent: Most welcome.
Output:
book