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 Input:
customer: Hello. 
 agent: Hello. How can I help you at this moment? 
 customer: Owing to an emergency, I want to cancel my recent reservation. Can you help me out? 
 agent: Sure, I will help you with that. Can you please mention your name for further process? 
 customer: Barbara Jones. 
 agent: Ok, please hold on a moment. 
 customer: Ok, take your time. 
 agent: There is no previous reservation available under your name. 
 customer: That's ok. Anyways, thank you. 
 agent: Thank you for reaching us.

Ex Output:
no_reservation


Ex Input:
customer: Hello. 
 agent: Hello. How may I assist you? 
 customer: I want to cancel my recent reservation, can you please help me with this? 
 agent: May I know your good name please? 
 customer: I am John Jackson. 
 agent: Please give me a moment. 
 customer: Sure. 
 agent: There is a reservation found with your given name. Shall I proceed with the cancellation? 
 customer: Ok, please cancel my booking. 
 agent: Your ticket has been cancelled. 
 customer: Thank you for your help. 
 agent: Thank you for choosing us.

Ex Output:
cancel


Ex Input:
customer: Hello. 
 agent: Hello. 
 customer: I am Michelle Martinez. 
 agent: Martinez, how may I assist you today? 
 customer: I want to visit Seattle, can you help me in booking a ticket? 
 agent: Sure, I will help you, may I know your airport codes? 
 customer: My airport codes are from CLT to SEA. 
 agent: When you are going to start your journey? 
 customer: I want to start my journey on 12/26 and return on 12/28. 
 agent: Ok, wait for a moment please. 
 customer: Ok. 
 agent: Sorry to say this, no flights as per your details. 
 customer: No problem, thank you for checking. 
 agent: It is my pleasure, have a nice day.

Ex Output:
no_flight