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
--------
Question: 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.

Answer: no_flight


Question: customer: Hello. 
 agent: Hello, how may I assist you? 
 customer: Gary King here, I want to travel from LAX to LAS to meet my friend on her birthday. 
 agent: Ok, Do you need a stopover in between? 
 customer: I need one stopover in between my journey. 
 agent: Please share your travel dates. 
 customer: 10/12 to 10/14. 
 agent: Ok, please wait. There is an UA airline with flight number 1024 is available for you on your requested dates. Shall I proceed with this booking? 
 customer: Yes, you can proceed. 
 agent: Your booking has been done. 
 customer: Thank you. 
 agent: Thank you for choosing us.

Answer: book


Question: customer: Hello, I am Carol Hill. 
 agent: Hello, how may I aid you today? 
 customer: I want to attend a workshop in my college at Austin, so could you please avail me a flight ticket on 04/21? 
 agent: Sure, please forward your source and destination airport codes? 
 customer: My source and destination airport codes are from FL-MCO to TX-AUS. 
 agent: When would you like to return? 
 customer: I would like to return on 04/23. 
 agent: Sorry no flights are available with your request. 
 customer: No problem, thank you. 
 agent: Thanks for opting us.

Answer:
no_flight