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: Hi. 
 agent: Hello. How may I assist you? 
 customer: I would like to cancel my reservation as I am leaving for delegates meet, can you please help me out? 
 agent: Sure, may I know your name? 
 customer: I am Susan Harris. 
 agent: Sorry, there is no active reservation on your name. 
 customer: That's ok, thank you. 
 agent: Thank you.
Output:
no_reservation