Definition: 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: customer: Hello. 
 agent: Hello, how can I help you today? 
 customer: I would like to cancel my reservation as I am leaving for hometown, can you please help me out? 
 agent: Sure, I will help you with that. May I know your good name? 
 customer: Gary Roberts here. 
 agent: Please wait for a while. 
 customer: Sure. 
 agent: Thanks for waiting, there is no active reservation on your name. 
 customer: Ok no problem, thank you for your services. 
 agent: Thank you for availing us.
Output:
no_reservation