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

customer: Hi, myself Jack Thomas. 
 agent: Hello Jack, how may I help you? 
 customer: I need your help in booking my flight ticket from ATL to IAD, can you please help me? 
 agent: Sure, I can help you. May I know your journey dates? 
 customer: Sure, I would like to depart on 01/17 and return on 01/19. 
 agent: Please give me a moment. 
 customer: Sure. 
 agent: Spirit airlines with flight 1015 is available on your route. 
 customer: That's fine for my journey, you can proceed for booking the ticket. 
 agent: Your ticket is reserved. 
 customer: Thank you very much for your help. 
 agent: Thank you for choosing us.
book

customer: Hello. 
 agent: Hello. 
 customer: I am Elizabeth Wilson. 
 agent: How may I assist you today? 
 customer: Can you please help me in booking my flight ticket from IAD to PHL? 
 agent: Sure, please provide me your travel dates. 
 customer: Ok, my travelling dates are 09/12 and 09/14. 
 agent: Frontier airline is providing flight for you with price 100. Shall I proceed? 
 customer: Ok, please proceed. 
 agent: Your ticket has been booked with flight-1019. 
 customer: Thank you. 
 agent: My pleasure.
book

customer: Hi. 
 agent: Hello. 
 customer: I am Rachel Lee. 
 agent: How may I serve you? 
 customer: I want to change my reservation, can you help me? 
 agent: Sure, I will help you with the change of flight reservation. 
 customer: Ok. 
 agent: Please wait for a moment. 
 customer: Sure. 
 agent: Thanks for waiting. But I am sorry to say that there is no flight reservation on your name to change it. 
 customer: That's ok. Thank you for your help. 
 agent: Thank you.
no_reservation