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: Hello. 
 agent: Hello. 
 customer: I am Helen Moore. 
 agent: How can I help you? 
 customer: I need to cancel my reservation due to some personal issues.So can you help me with cancellation of my reservation? 
 agent: Sure, let me check your reservation details in our database. 
 customer: Ok. 
 agent: Sorry, I did not find any reservation by your name in our database. 
 customer: No problem, thanks for your information. 
 agent: Thank you for reaching us.
Solution:
no_reservation