Detailed Instructions: 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
Problem:customer: Hi. 
 agent: Hello. 
 customer: Brandon Lopez here. 
 agent: How may I assist you? 
 customer: Can you cancel my flight ticket reservation? 
 agent: Sure, I am here to help you out. 
 customer: Ok. 
 agent: Wait a moment please. Brandon Lopez, we regret to inform you that there is no reservation found on your name in our records. 
 customer: Ok, that is not a problem. Thank you. 
 agent: Thank you for reaching us.
Solution:
no_reservation