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: Hello. 
 agent: Hello. 
 customer: I am Elizabeth Walker. 
 agent: How may I assist you today? 
 customer: Will you please assist me in booking a flight ticket from ATL to CLT? 
 agent: Sure, may I know your travelling dates, please? 
 customer: I am planning to depart on June 07 and return on June 09. 
 agent: Do you need any specification? 
 customer: I need a halt in between my journey. 
 agent: Sorry, there are no flight tickets available on your journey dates. 
 customer: Ok, no problem. 
 agent: Thank you for reaching our service. 
 customer: Thank you for the information.
no_flight

customer: Hi. 
 agent: Hello, how may I help yo today? 
 customer: Stephen Harris here. Please help me out in booking the ticket from MSP to EWR. 
 agent: Sure, can you please mention with your dates of journey? 
 customer: My trip dates will be Mar 27 to Mar 29. 
 agent: Ok, may I know your airline preference please? 
 customer: No. 
 agent: May I know your class preference please? 
 customer: Business class. 
 agent: Please wait for a mean while. 
 customer: Ok. 
 agent: Sorry Stephen, there is no flight found as per your travelling details. 
 customer: That's ok, thank you. 
 agent: You are welcome.
no_flight

customer: Hello. 
 agent: Hello. How can I help you today? 
 customer: Actually I am trying to modify the details in my previous ticket which is booked in the last week but due to some server problem I am not getting that. Can you please help me in changing? 
 agent: Sure, I am happy to help you. 
 customer: Thank you for receiving my request. 
 agent: Sure, can I know your name? 
 customer: My name is Deborah Martinez. 
 agent: Sorry for the inconvenience, there is no reservation found on your name. 
 customer: Actually my brother had tried to modify the details but by mistake he cancelled the ticket. I asked him know only. Sorry for wasting your time. Anyway's thank you for checking. 
 agent: Ok, thank you for approaching us. 
 customer: You are welcome.
no_reservation