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: Hi. 
 agent: Hello, how may I be at your service today? 
 customer: Due to some entrepreneurship meeting, I am going to change my existing reservation. 
 agent: May I know your name please to check the status of your reservation? 
 customer: Sarah Lopez here. 
 agent: Thank you. Please stay online for a while, I will check your reservation status and let you know. 
 customer: Sure. 
 agent: Sorry, there is no reservation matching with your name in our portal to make changes further. 
 customer: No problem, thanks for the information. 
 agent: Thank you for reaching us.

Output: no_reservation


Input: Consider Input: customer: Hello. 
 agent: Hello. How can I help you? 
 customer: I am Kenneth Thomas. My trip has been postponed, can you change my reservation? 
 agent: Sure, wait for a minute. 
 customer: Ok. 
 agent: Sorry Kenneth, no reservation found on your name. 
 customer: It's fine. 
 agent: Thank you for reaching us. 
 customer: Anyway, thank you for your information.

Output: no_reservation


Input: Consider Input: customer: Hi. 
 agent: Hello. 
 customer: Patricia Young here. 
 agent: How may I render you at this moment? 
 customer: Can you book a flight ticket for my airport codes that is from BOS to DCA? 
 agent: Sure, on which dates would you like to travel? 
 customer: The trip dates are from Sept 26 to Sept 28. 
 agent: Ok, do you need a lay by in between the journey? 
 customer: Yes. 
 agent: Do you have any other preferences? 
 customer: No, that is it. 
 agent: There is a Jet Blue airline with fare of 100 and a lay by in between the journey matches your schedule. 
 customer: I am ok with the airlines. You can book it. 
 agent: Your ticket has been confirmed with flight number 1005. 
 customer: Thank you. 
 agent: Thank you for reaching us.
Output: book