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

[Q]: customer: Hello. 
 agent: Hello, how can I help you? 
 customer: I have to do some modification in my previous flight ticket booking that there is a sudden event held at my home town, so I am unable to travel the trip. Can you please help me out in changing my reservation? 
 agent: Sure, I am here to help you. May I know your name? 
 customer: Thank you and myself Brian Wilson. 
 agent: Ok, please wait for a moment. 
 customer: Sure. 
 agent: Thank you for your time, There was no reservation found on your name in our database. 
 customer: It's ok, thank you for your help. 
 agent: Thank you for choosing us.
[A]: no_reservation


[Q]: customer: Hello. 
 agent: Hello\. How may I help you? 
 customer: Mark Phillips here. Can you please help me in booking the ticket from LGA to AUS? 
 agent: May I know your trip dates? 
 customer: My trip dates are 03/21 and 03/23. 
 agent: There is a direct flight with flight number 1018, can I proceed? 
 customer: Please search for a flight with 1 halt. 
 agent: I am sorry to inform you that there is no flight available with 1 connection. 
 customer: That's ok, thank you for giving the information. 
 agent: Thank you for contacting us.
[A]: no_flight


[Q]: customer: Hello. 
 agent: Hello, how may I assist you? 
 customer: My name is Linda Wilson. 
 agent: Yes, Linda. 
 customer: I want to change my existing reservation because my exam has been postponed. Can you help me out? 
 agent: Sure, I will help you in modifying the reservation. 
 customer: Thank you. 
 agent: Please wait a moment, let me check the previous reservation details on your name. 
 customer: That's ok, no problem. 
 agent: Sure. In my search to your request, no reservation found on your name. 
 customer: Ok, may be my father has cancelled my reservation. 
 agent: Ok, please check your email again to verify your reservation details. 
 customer: Ok. Thank you for checking. 
 agent: My pleasure, thank you for reaching us. 
 customer: Welcome.
[A]:
no_reservation