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
Input: customer: Hello, I am Jennifer White. 
 agent: Hello, how may I serve you today? 
 customer: I want to change my recent reservation as my joining date got postponed. Can you please help me in changing? 
 agent: Sure, we are here to help you. Ok, please wait a minute. 
 customer: Ok. 
 agent: Thank you for your valuable time, unfortunately no reservation found with your name. 
 customer: Ok, no issues. Thank you for your quick service. 
 agent: Thank you for connecting with us.
Output:
no_reservation