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 may I aid you today from my end? 
 customer: My name is Brandon Moore. I would like to book a ticket from HOU to LAX. 
 agent: Sure, I am here to help you out. Please provide me your trip dates. 
 customer: My travel dates are Aug 08 and Aug 10. 
 agent: Do you have any requirement? 
 customer: I would like to travel by single connection flight and depart time should be in the evening. 
 agent: Sorry Brandon Moore, there is no flight to reserve a seat for you. 
 customer: No problem, thank you for the information. 
 agent: Thank you for reaching us.

Ex Output:
no_flight


Ex Input:
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.

Ex Output:
no_reservation


Ex Input:
customer: Hi. 
 agent: Hello. How can I assist you today? 
 customer: I want to cancel my recent reservation which I have done last week because my trip got cancelled. Please help me out with that. 
 agent: Sure, please provide your name for checking the reservation. 
 customer: Myself Dorothy Young. 
 agent: Please give me a moment. 
 customer: Sure. 
 agent: Thanks for waiting, there is no reservation found under your name. 
 customer: It's ok, thank you for your help. 
 agent: Welcome, have a great day.

Ex Output:
no_reservation