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: 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.
[A]: no_reservation


[Q]: customer: Hi. 
 agent: Hello. How can I help you at this moment? 
 customer: I want to change my existing reservation which is done recently due to some health issues, can you please help me? 
 agent: Sure, I will aid you in changing your reservation. 
 customer: Thank you for considering my request. 
 agent: May I know your name please. 
 customer: Sure, my name is Joshua Green. 
 agent: Sorry to say this, no reservation found on your name in our database. 
 customer: Ok, no problem. Thank you for your service. 
 agent: Thank you for reaching us.
[A]: no_reservation


[Q]: customer: Hello. 
 agent: Hello. How can I assist you? 
 customer: I am Anna Collins. I am planning to attend singing computation in  LAS, can you help in finding a flight from JFk? 
 agent: Can you please share on what dates you are willing to travel? 
 customer: I will be traveling on 02/15 and I might be return on 02/17. 
 agent: Please hold on a minute, I will get back with your details. 
 customer: Sure, take your own time. 
 agent: There is a flight available with 100 price, flight number is 1011.Shall I proceed the booking? 
 customer: Yes please proceed for booking with that flight. 
 agent: Number of connections are 2. 
 customer: Oh I want to travel in single connection flight. 
 agent: I am sorry, there is no flight with that connection. 
 customer: That's ok, thank you for your help. 
 agent: Thank you for reaching us.
[A]:
no_flight