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

[EX Q]: customer: Hello. 
 agent: Hello, how can I aid you today? 
 customer: Can you please help me to book a flight from BOS to SFO? 
 agent: Please provide your trip dates. 
 customer: Sure, I want to travel on Apr 13 and need to return on Apr 15. 
 agent: Do you need any connection limit? 
 customer: I need a flight with single connection. 
 agent: Is there any other specifications? 
 customer: My depart time must be in the evening. 
 agent: May I know your name? 
 customer: I am Virginia Parker. 
 agent: There are no flights available on your routes. 
 customer: Ok, not an issue. Thank you for checking. 
 agent: Thank you for choosing us.
[EX A]: no_flight

[EX Q]: 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.
[EX A]: no_reservation

[EX Q]: customer: Hi. 
 agent: Hello, how may I help you? 
 customer: I need to modify my reservation as I am not able to make a journey this time. So, can you help me in changing my reservation to some other time? 
 agent: Sure, may I know your name? 
 customer: Sure, my name is Ruth Nelson. 
 agent: There was no reservation found on your name. 
 customer: Not a problem, anyways thank you for the information. 
 agent: Thank you for reaching us.
[EX A]:
no_reservation