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: Hello. 
 agent: Hello, how may I help you? 
 customer: I want to change my reservation, can you help me with that? 
 agent: I can help you, can I know your name? 
 customer: Sure, Deborah Nelson here. 
 agent: Ok, please wait for a while. 
 customer: Sure. 
 agent: Sorry Nelson, there is no active reservation found with your name. 
 customer: Oh, it's very sad to hear from your side. Thanks for the information. 
 agent: My pleasure.

Output: no_reservation


Input: Consider Input: customer: Hello. 
 agent: Hello. How may I aid you today? 
 customer: My name is Robert Scott, please book me a plane ticket from BOS to OAK. 
 agent: Sure, I will help you with booking, please share your travelling dates? 
 customer: Sure, my travelling dates are from 10/23 to 10/25. 
 agent: There is a flight in UA airline with connection 1 as per your details, can I proceed to booking? 
 customer: I need 0 connected flight. 
 agent: Sorry, no flights as per your details. 
 customer: It's ok, thank you for the information. 
 agent: You are welcome. Thank you for reaching us.

Output: no_flight


Input: Consider Input: customer: Hello. I am Jerry King. 
 agent: How can I help you? 
 customer: Can you book a flight ticket for me from IAH to EWR? 
 agent: May I know your trip dates? 
 customer: My trip dates are on 05/20 and back on 05/22. 
 agent: Sorry, there are no flights that are moving to your region when I have checked on those dates. 
 customer: Ok, no problem with that one, thank you for your search and information. 
 agent: Thank you for reaching us, have a nice day.
Output: no_flight