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. 
 customer: I am Barbara Young. 
 agent: How can I help you? 
 customer: Please, help me in cancelling my reservation as my plan to attend a seminar got cancelled. 
 agent: Sure, I will help you to cancel your reservation. 
 customer: Thank you. 
 agent: Please give me a moment. 
 customer: Sure, take your time. 
 agent: Sorry, no reservation found on your name to cancel your reservation. 
 customer: It's ok, not an issue. Thank you for the information. 
 agent: Welcome, have a nice day. Thank you for choosing us.
Output:
no_reservation