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

customer: Hi,. 
 agent: Hello, how may I help you? 
 customer: I made my earlier reservation with my name Karen Nelson, Could you help me in changing my reservation? 
 agent: Ok, please wait for a moment. 
 customer: Sure. 
 agent: Sorry, there was no reservation found with your name. 
 customer: Ok, thank you for quick response. 
 agent: Thank you for opting us.
no_reservation