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 aid you? 
 customer: Due to an emergency, I want to change my reservation. Can you help me? 
 agent: Sure, we are here to help you. May I know your good name please? 
 customer: Deborah Campbell here. 
 agent: Please wait for a minute. 
 customer: Sure. 
 agent: Sorry to inform that, there is no reservation found on your given name. 
 customer: No problem, Thanks for the information. 
 agent: Thanks for reaching us, have a nice day.
Output:
no_reservation