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, what can I do for you today? 
 customer:  I made a reservation earlier this week to give a seminar, but my seminar has been postponed. Can you please help me in changing my reservation? 
 agent: Sure, let me know your name to check for your reservation status? 
 customer: Cynthia Harris here. 
 agent: Please stand by. 
 customer: Ok. 
 agent: Sorry, no reservation found on your name in our portal to change it. 
 customer: No issue, Thank you for the information. 
 agent: Thank you for contacting us.
Output:
no_reservation