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 can I help you today? 
 customer: I am Dorothy Turner, I am going to Washington DC to take tour of White house with my family. Help me to find a flight of price 1000. 
 agent: Could you please provide me airport codes? 
 customer: I will fly from NC-CLT to DC-IAD. Please find a flight with single connection. 
 agent: Sure. To check with availability of flights, I need your travel dates. 
 customer: My travel dates are for depart is 06/29 and returning on 07/01. 
 agent: Please be online, I will revert you with flight details. 
 customer: Ok. 
 agent: Thanks for your time, Delta airline is available with flight number 1015. Can I process the booking? 
 customer: Yes. 
 agent: Ok, Your ticked is confirmed.Thanks for reaching us. 
 customer: Thanks for your service.

Ex Output:
book


Ex Input:
customer: Hello. 
 agent: Hello, how may I assist you today? 
 customer: Can you please help me in booking a flight ticket from LAS to EWR? 
 agent: Sure, can you please let me know your travel dates? 
 customer: I want to fly on July 06 and return on July 08. 
 agent: Do you prefer a connection in between the journey? 
 customer: I need a single connection. 
 agent: Do you have any other requirements? 
 customer: I don't have any other requirements. 
 agent: Ok, please wait for a minute. 
 customer: Ok. 
 agent: We found a connecting flight in Hawaiian Airlines with flight number 1022 having an economy class. Shall I proceed for booking? 
 customer: You can proceed to booking. 
 agent: May I know your name to book a ticket? 
 customer: Myself Nicole Phillips. 
 agent: Your booking has been processed. 
 customer: Thank you. 
 agent: Thank you for approaching us.

Ex Output:
book


Ex Input:
customer: Hello, I am Steven Scott. 
 agent: Hello, how may I serve you for the day? 
 customer: I want to change my reservation as the beer festival which I want to go got postponed. 
 agent: Ok. 
 customer: Can you please help me? 
 agent: Sure. Please wait a minute. 
 customer: Ok. 
 agent: Thanks for your time, we did not find any reservation with your name. 
 customer: It's ok, no problem. Thank you for your information. 
 agent: Thank you for availing us.

Ex Output:
no_reservation