Teacher: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
Teacher: Now, understand the problem? Solve this instance: customer: Hello, I am Kimberly Phillips. 
 agent: Hello. How can I aid you? 
 customer: I want to fly from DCA to LAX to meet my friend, can you please help me to book a flight ticket? 
 agent: Sure. May I know your travelling dates? 
 customer: Sure, my journey dates are 11/21 to 11/23. 
 agent: Do you have any specifications? 
 customer: Yes, I need a halt. 
 agent: There is a flight 1008 in UA airline and price 100 with a connection. Shall I proceed? 
 customer: Ok, book the ticket. 
 agent: Your reservation has been done. 
 customer: Thank you for your help. 
 agent: Thank you.
Student:
book