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. My name is Virginia Perez. 
 agent: Hello. Virginia Perez, what can I do for you today? 
 customer: I want to go for holiday trip to New York. Can you help me in booking a flight ticket on 11/21? 
 agent: Sure, we will help you in booking. How much can you afford for this trip? 
 customer: I can afford up to 1000. 
 agent: OK, do you need a return ticket also? 
 customer: Yes, I will be return on 11/23. 
 agent: Ok, please provide me your airport codes so that I can check the availability. 
 customer: My airport codes are from EWR to JFK. 
 agent: Do you have any other request to met? 
 customer: I need stopover in my journey. 
 agent: Ok Virginia, please give me a moment and I will revert to you. 
 customer: Sure. 
 agent: Sorry to inform you that there is no flight available with single stopover. 
 customer: Ok, No issues. Thank you. 
 agent: Thank you for reaching our service.

Ex Output:
no_flight


Ex Input:
customer: Hello. 
 agent: Hello, may I know your name please? 
 customer: Yes, myself Sandra Taylor. 
 agent: How can I help you? 
 customer: I want to book a flight ticket from DEN to DCA. 
 agent: May I know your travelling dates please? 
 customer: I want travel in the dates of 12/10 and 12/12. 
 agent: Sorry Sandra, there are no flights available regarding your journey. 
 customer: Ok, thank you for your information. 
 agent: Thank you and have a nice day.

Ex Output:
no_flight


Ex Input:
customer: Hello, Betty Lewis is my name. 
 agent: Hello, how may I assist you today? 
 customer: Can you please book a connected flight from Minneapolis & St. Paul, MN - MSP? 
 agent: Sure, we will help you. Ok, please let me know your journey dates. 
 customer: My journey dates are 02/27 and 02/29. 
 agent: May I know your destination point? 
 customer: I want to land at New York, NY - LGA. 
 agent: Ok, please wait for a while. 
 customer: Sure. 
 agent: Thanks for your time, we found a direct flight based on your given data. 
 customer: Do not proceed for booking. 
 agent: Ok. 
 customer: Thanks for your help. 
 agent: Thank you for choosing us.

Ex Output:
no_flight