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,. 
 agent: Hello, How can I help you today? May I know your good name? 
 customer: I am Sarah Collins. I want to fly from Detroit to Philadelphia. Can you book a ticket for me? 
 agent: Sure, it's my pleasure to help you. May I know the airport codes and journey dates? 
 customer: Ok. Airport codes are DTW - PHL, Travelling dates are 09/21 to 09/23. And I need one flight connection with price below 500. 
 agent: Thank you for the details. Please wait a minute while I will check and revert you. 
 customer: Sure. 
 agent: Thank you for waiting, we are glad to inform you that we found a flight regarding your details. 
 customer: Ok, Can I know the flight details? 
 agent: The details are as follows JetBlue airline, flight number 1005, price limit 200 with one connection. 
 customer: You can proceed with the booking. 
 agent: Ok, Your ticket has been booked. Happy journey. 
 customer: Thank you for your great service. 
 agent: Thank you for choosing us. Have a nice day.
Student:
book