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

Example Input: customer: Hello. 
 agent: Hello, how can I assist you? 
 customer: I am planning to book a flight ticket to DCA from OAK, can you please help me out? 
 agent: Sure, I can help you with that. May I know your travel dates please? 
 customer: Sure, my planned travelling dates are May 24 and May 26. 
 agent: May I know how many connections are you expecting in between your journey? 
 customer: Sure, I am looking for a flight with 1 connection. 
 agent: Please let me know if you have any other specifications. 
 customer: That's all for now. 
 agent: Can I have your good name please? 
 customer: Sure, my name is Jason Young. 
 agent: JetBlue airlines is providing a flight on that route with ticket fare of 100 and single connection, it will departs at 12:00 hours and arrives at 5:00 hours. Shall I proceed for booking? 
 customer: Ok, please confirm my reservation. 
 agent: I have successfully booked you an economy class ticket in flight-1014, have a safe journey. 
 customer: Thank you for the help. 
 agent: Thank you for choosing us.
Example Output: book

Example Input: customer: Hi. 
 agent: Hello, how can I help you today? 
 customer: Can you help me to book a flight from PHL to DTW? 
 agent: Sure, let me know your travel dates? 
 customer: I would like to travel on Sept 26 and 28. 
 agent: Do you have any requirements? 
 customer: I need a connecting flight. 
 agent: Ok, may I know your name please? 
 customer: My name is Sandra Hall. 
 agent: United Airlines has a connecting flight with number 1005 for fare 100, shall I proceed? 
 customer: Proceed with booking. 
 agent: Your ticket is reserve in economy class. 
 customer: Thank you. 
 agent: Thank you for opting us.
Example Output: book

Example Input: customer: Hello. 
 agent: Hello, How exactly I can serve you the best today? 
 customer: I am Michael Brown. I want to cancel my reservation, due to my health issues. So please help me in the cancellation. 
 agent: Sure, I will help you with that. Please wait a while. 
 customer: Sure. 
 agent: Thank you for waiting. I have checked in reservation list to cancel your ticket, but could not find any reservation with your name. 
 customer: Not an issue. Thank you. 
 agent: Thank you for reaching us.
Example Output:
no_reservation