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

customer: Hello. 
 agent: Hello. How can I help you? 
 customer: My name is Stephen Johnson. As my business trip got postponed to other dates, I would like to change my existing reservation. 
 agent: Please wait for a while. 
 customer: Sure. 
 agent: Sorry, there is no reservation found by your name. 
 customer: That's fine. Thank you for your information. 
 agent: Thank you and have a nice day.
no_reservation

customer: Hello. 
 agent: Hello, how can I assist you? 
 customer: Could you please help me in flight ticket booking process from AUS to OAK? 
 agent: Sure, I can help you with that. May I know your travel dates please? 
 customer: Thank you for your response, I want to take off on Dec 11 and book my return ticket also on Dec 13. 
 agent: May I know how many stopovers do you need in between your journey? 
 customer: Yes, I want a connecting a flight. 
 agent: Please let me know if you have any other specifications. 
 customer: I would like to travel in business class flight. 
 agent: Can I have your good name please? 
 customer: Sure, my name is Larry Hernandez. 
 agent: Ok, please wait. 
 customer: Ok. 
 agent: Sorry to inform you that there are no flights available for you on those dates with your given details. 
 customer: Oh! It's ok no problem. Thank you for your information. 
 agent: Thank you for choosing us.
no_flight

customer: Hello. I am Helen Hall. 
 agent: Hello, how can I assist you today? 
 customer: Can you help me booking a flight ticket from DCA to LAS? 
 agent: Sure, I am glad to help you. 
 customer: Thank you. 
 agent: May I know your journey dates please? 
 customer: I will start on 03/24 and return on 03/26. 
 agent: Ok, please share your specifications. 
 customer: I need a break in my journey. 
 agent: Thanks for your details, please wait. 
 customer: Sure. 
 agent: Thank you for waiting, we found a connecting flight with a fare of 100 in 1019 Hawaiian airline. 
 customer: Please proceed with the booking. 
 agent: Ok, your ticket has been confirmed. 
 customer: Thank you for your kind service. 
 agent: Thank you for opting us.
book