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: Hi. 
 agent: Hello, how can I assist you? 
 customer: Rebecca Gonzalez here. Please help me out in booking the ticket from OAK to BOS. 
 agent: Sure, can you please provide your travel dates? 
 customer: My trip dates will be 07/28 to 07/30. 
 agent: Do you have any preferences? 
 customer: My depart time must be in the morning. 
 agent: Is there any class preference? 
 customer: No. 
 agent: Ok, please wait a minute. 
 customer: Ok. 
 agent: We found an American airline with flight 1019 having a fare 100 with stopover. Shall I proceed with booking? 
 customer: Please proceed. 
 agent: Your booking has been done. 
 customer: Thank you. 
 agent: Thank you.

Ex Output:
book


Ex Input:
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.

Ex Output:
no_flight


Ex Input:
customer: Hello. 
 agent: Hello,. 
 customer: Donna Lopez is here. 
 agent: How can I aid you today? 
 customer: My wish is to go for a trip to MSP from DFW along with my family. 
 agent: Ok. 
 customer: Will you be my helping hand in making a reservation? 
 agent: Sure, we are glad to assist you. 
 customer: Thank you. 
 agent: May I know your depart date? 
 customer: My departure date is 05/28. 
 agent: Do you have any preference? 
 customer: Price limit is 500. 
 agent: When you want to catch your return flight? 
 customer: 05/30 is my return date. 
 agent: Thanks for sharing your details. 
 customer: It's Ok. 
 agent: We found a plane 1021 of UA airline couple of connections. Shall I reserve? 
 customer: No, do not proceed. Thank you for aiding me. 
 agent: Ok, thank you for reaching us.

Ex Output:
no_flight