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: Hi. 
 agent: Hello. How may I assist you today? 
 customer: Can you please book my flight ticket from EWR to MSP? 
 agent: Sure, I will help you. On which dates do you want to travel? 
 customer: My trip dates are 04/13 and 04/15. 
 agent: Could you please provide your name to book your flight ticket? 
 customer: Myself Dennis Brown. 
 agent: Ok, please hold on a moment to check the flights availability. 
 customer: Ok. 
 agent: Based on your information, flight number 1018 from Frontier airlines with 1 connection with the fare of 300 is available for you. Shall I proceed with this? 
 customer: Can you please search a flight ticket with price 200 or otherwise don't confirm this ticket. 
 agent: Sorry to inform you that, there are no flights available with in that budget. 
 customer: Ok, fine thank you for searching a flight ticket for me. 
 agent: Thank you for approaching us, have a great day.
Example Output: no_flight

Example Input: customer: Hello. I am Michael Lopez. 
 agent: Hello, how can I help you today? 
 customer: I need to book a ticket to meet my parents on 05/15. Could you please help me in booking a return ticket on 05/17? 
 agent: Sure, please share me your source and destination. 
 customer: My source and destination code is DTW and LAS. 
 agent: May I know your connection limit? 
 customer: I need a stopover in between the journey. 
 agent: Please wait for a moment. I will check the availability of the flights. 
 customer: Sure. 
 agent: We are glad to say that, we found an airline: UA, flight number: 1002 with a single connection and price is 100. 
 customer: You can proceed with booking. 
 agent: Your flight ticket has been reserved. 
 customer: Thank you for your quick response. 
 agent: Thank you for opting us.
Example Output: book

Example Input: customer: Hello. 
 agent: Hello, how can I abet you? 
 customer: Gregory Roberts this side. I want to change my existing reservation, due to some health issue. can you please help me? 
 agent: Sure, I will help you with that. Can you please wait while I check? 
 customer: Ok, take your time. 
 agent: Sorry Gregory, there is no reservation on your name. 
 customer: It's ok, thank you for checking. 
 agent: Thank you for reaching us.
Example Output:
no_reservation