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 serve you today? 
 customer: I want to cancel my recent reservation as my plan to meet my friend has been postponed. Can you help me with that? 
 agent: Sure, I will help you with that. 
 customer: Thank you. 
 agent: Please share me your good name please? 
 customer: I am Laura Turner. 
 agent: Please wait for a moment. 
 customer: Sure, I will wait. 
 agent: Thank you for waiting, sorry there is no reservation found on your name in our system data. 
 customer: Ok, no problem. Thank you for your information. 
 agent: Thank you for reaching us, have a nice day ahead.
Output:
no_reservation