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: Hello. 
 agent: Hello, how may I assist you? 
 customer: Is it Central Booking Agency? 
 agent: Yes, say what help are you expecting from my side? 
 customer: Can you book a flight ticket from AUS to LGA? 
 agent: Sure, please mention your dates of trip? 
 customer: It's from 02/09 to 02/11. 
 agent: Ok, please hold on for a moment. 
 customer: Ok, take your time. 
 agent: Sorry, there is no flight is available as per your respective details. 
 customer: Ok, no problem. 
 agent: May I know your name please? 
 customer: Sure, my name is Brenda Clark. 
 agent: Thank you for your information. 
 customer: That's ok. 
 agent: You are welcome.

Ex Output:
no_flight


Ex Input:
customer: Hi. 
 agent: Hello. How may I aid you? 
 customer: I am Eric Lewis. Can you help me in booking from MCO to PHX? 
 agent: May I know your itinerary dates please? 
 customer: My travelling dates are from Jan 8 to Jan 10. 
 agent:  May I know your preferable journey timings? 
 customer: I want to return in the morning time. 
 agent: Is there any another specifications on your trip, so that I can arrange like that only. 
 customer: I need a connecting flight. 
 agent: I got a connecting flight-1023 in economy class, is it fine for you? 
 customer: Ok, please book it. 
 agent: Ok, booking is done on UA airlines. 
 customer: Thank you. 
 agent: Thanks for reaching us.

Ex Output:
book


Ex Input:
customer: Hello, I am Margaret Phillips. 
 agent: Hello, how may I support you today? 
 customer: I would like to attend a meeting with my client in Fisher Building at Detroit, DTW. Can you help me with booking a connecting flight ticket? 
 agent: Sure, may I know your source point? 
 customer: My source code is LGA. 
 agent: Ok, help me with your dates. 
 customer: My travelling dates are from 11/22 to 11/24. 
 agent: Ok, please hold on a minute. 
 customer: OK. 
 agent: Thanks for being on hold, there is a 1018 number flight with a fare of 100 in Spirit airlines. 
 customer: You can proceed with booking. 
 agent: Ok, your seat has been confirmed. 
 customer: Thank you for the help. 
 agent: Thank you for choosing us.

Ex Output:
book