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 help you today? 
 customer: Due to urgent work, I would like to change my reservation to some other date, can you please help me out with that? 
 agent: Sure, we are here to help you. 
 customer: Thank you for your positive response. 
 agent: May I know your good name please? 
 customer: Sure, my name is Christine Rodriguez. 
 agent: Please wait a minute. 
 customer: Ok. 
 agent: Sorry, there is no reservation on your name in our database. 
 customer: It's ok no problem. Thank you for your information. 
 agent: Thank you for opting us.
Output:
no_reservation