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: Hi. Sharon Brown here...... 
 agent: Hello, do you need any help from us? 
 customer: Please help me out in booking the ticket from IAD to PHL. 
 agent: Sure, could you please share your departure and arrival day? 
 customer: My trip dates will be May 16 to May 18. 
 agent: The economy class with flight number 1018 of Frontier airline is available having fare as 100 and connection as 0, is it ok for you? 
 customer: Can you please tell me return time? 
 agent: Ok, the return time is in morning. 
 customer: Please proceed. 
 agent: Ok, your reservation is confirmed. 
 customer: Thank you. 
 agent: You are welcome, have a great day.
Student:
book