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: Hi, I am Patricia Green. 
 agent: Hello, How can I assist you? 
 customer: As my plan to meet my uncle got postponed, can you please help me in changing my existing reservation? 
 agent: Sure, I am blissful to help you. Please wait a while. 
 customer: Sure. 
 agent: Thank you for waiting. I have checked in reservation list to change your ticket, but could not find any reservation with your name. 
 customer: That's ok, thank you for the information. 
 agent: Thank you for choosing us, Have a great day. 
 customer: Thank you.
A:
no_reservation