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 can I help you? 
 customer: Can you please help me in booking my flight ticket from DFW to LAX? 
 agent: Sure, May I know your travelling dates? 
 customer: My planned travel dates are Nov 25-27. 
 agent: Do you have any connection limit? 
 customer: I need a connecting flight. 
 agent: Is there any class preference? 
 customer: I need to fly in economy class. 
 agent: May I know your name? 
 customer: My name is Ronald Thompson. 
 agent: You have a connecting flight 1012 in Spirit airline and price 100 with a connection, Shall I proceed? 
 customer: Ok, please go ahead. 
 agent: Your ticket has been reserved in economy class. 
 customer: Thank you for your help. 
 agent: Thank you.
Output:
book