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 help you? 
 customer: Myself Mark Brown here. I  need to fly Las Vegas for my college admission, could you please help me in booking my flight ticket from ATL to LAS? 
 agent: Sure, can you please let me know your journey dates that you wish to travel? 
 customer: My travel dates are 11/11 and 11/13. 
 agent: Do you need a flag stop in between your journey? 
 customer: I need a connecting flight. 
 agent: May I know how much do you want to spend on flight ticket? 
 customer:  I can spend upto 500. 
 agent: Please wait for a while. 
 customer: OK. 
 agent: We found a flight in Southwest airlines, flight number is 1005 with one connection price is 100. Shall I proceed? 
 customer: Ok, you can proceed. 
 agent: Ok, your ticket has been confirmed in economy class. 
 customer:  Thank you for booking. 
 agent: Thank you for opting us.

Ex Output:
book


Ex Input:
customer: Hello. 
 agent: Hello. How can I help you? 
 customer: I would like to book a ticket from MCO to DEN, can you please help me out? 
 agent: Can I know your travelling dates? 
 customer: I am travelling on these dates April 20th and 22nd. 
 agent: Is there any airline preference? 
 customer: I don't have any preference. 
 agent: Do you have any class preference? 
 customer: I don't have any other preferences. 
 agent: Let me know your name. 
 customer: Janet Phillips here. 
 agent: Connecting flight can be booked with Hawaiian airlines for price 100 having flight number 1000. 
 customer: Ok, you can proceed. 
 agent: Ticket is booked. 
 customer: Thank you for your services. 
 agent: Thank you.

Ex Output:
book


Ex Input:
customer: Hello. 
 agent: Hello, how can I assist you today? 
 customer: I need your assistance in cancelling the reservation, as my friend met with an accident. 
 agent: Sure, may I know your good name? 
 customer: The reservation was in the name of Linda Collins. 
 agent: Please wait for a moment. 
 customer: Sure, I will wait. 
 agent: Sorry to say that, no reservation was found with your good name. 
 customer: Fine, thank you. 
 agent: Thank you for reaching us.

Ex Output:
no_reservation