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? 
 customer: I want to change dates in my recent reservation, can you please help me? 
 agent: Sure, may I know your name please? 
 customer: The ticket is booked under the name Carol young. 
 agent: Wait a while, Kindly. 
 customer: Sure, I will wait. 
 agent: Thank you for waiting, there is no reservation found for the user name in our data base to change your previous booking. 
 customer: No issue, anyway thank you for checking. 
 agent: Thank you for opting us.
Output:
no_reservation