Detailed 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
Q: customer: Hello. 
 agent: Hello. What help that I can do for you? 
 customer: I would like to cancel my flight reservation as my trip got postponed, can you please help me? 
 agent: Sure, I can help you. Can I know your name please? 
 customer: Thank you, my name is Kathleen Williams. 
 agent: Be on hold for a moment to check it. 
 customer: Ok. 
 agent: Sorry to say that there is no reservation found for the user name in our back end to cancel your ticket booking. 
 customer: Ok, thank you for the information. 
 agent: You are most welcome and have a nice day.
A:
no_reservation