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

Input: Consider 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.

Output: no_flight


Input: Consider 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.

Output: no_flight


Input: Consider Input: customer: Hello. 
 agent: Hello. How can I help you today? 
 customer: I am looking for a flight which will be travelling from Denver to EWR. Can you please help me in this? 
 agent: Sure, I am gleeful to help you with that. May I know your travelling dates, please? 
 customer: My travel dates are from Oct 24 to Oct 26. 
 agent: Can I know your connection limit? 
 customer: I am fine comfortable with minimum 1 connection limit. 
 agent: Do you have any class preference? 
 customer: No that's it, thank you. 
 agent: Is there any other requirements regarding on your journey? 
 customer: No. 
 agent: There is a connecting flight-1000 available in Jet Blue Airlines with a fare of 100. Shall I book it? 
 customer: Please proceed my booking with my name of David Thompson. 
 agent: David Thompson, your booking is done in economy class. 
 customer: Thank you so much.
Output: book