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

Example Input: customer: Hi. 
 agent: Hello, how may I assist you? 
 customer: Can you change my existing reservation? Because I postponed my trip due to ill health. 
 agent: Ok, please share your name. 
 customer: I am Carol Lewis. 
 agent: Wait a minute. 
 customer: Sure. 
 agent: Sorry, we could not found any reservation on your name. Sorry, there is no reservation found on your name. 
 customer: Thank you for your information. 
 agent: Thank you for choosing us.
Example Output: no_reservation

Example Input: customer: Hello. 
 agent: Hello, how can I assist you today? 
 customer:  I am Pamela Gonzalez. I want to cancel my recent reservation, because I want to travel  with my friends by road. Can you help me in cancelling? 
 agent: Sure, please wait for a moment. 
 customer: Ok. 
 agent: Sorry to say that, no reservation was found with your good name. 
 customer: Thank you for your help. 
 agent: Thank you for reaching us.
Example Output: no_reservation

Example Input: customer: Hello. 
 agent: Hello, how can I help you? 
 customer: I am Donna Carter. Please book a flight ticket from Chicago, ORD to Seattle, SEA. 
 agent: Sure, we are here to help. Let me know when you are willing to travel? 
 customer: My travelling dates are from 02/24 to 02/26. 
 agent: Ok, do you need any halt in your journey? 
 customer: Yes, I need a halt in my journey. 
 agent: Wait a minute please. 
 customer: Sure. 
 agent: We found Jetblue airline with connecting flight and number 1028 fare of 100. Shall I confirm it? 
 customer: Ok, You can proceed. 
 agent: Your ticket has been confirmed. 
 customer: Thank you. 
 agent: Thanks for approaching us.
Example Output:
book