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 may I guide you today? 
 customer: Due to some entrepreneurship meeting, I am going to change my existing reservation. Can you please help me in changing the reservation? 
 agent: Sure. I am gleeful to help you with that. Can you please share your name? 
 customer: I am Jessica Hill. 
 agent: Thank you for waiting. Jessica Hill, there is no active reservation found under your name to do changes in that. 
 customer: No problem, thank you for the information. 
 agent: Thank you for reaching us, have a great day,.
Output:
no_reservation