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. How may I help you? 
 customer: William Miller here. I want to change my reservation due to my office meeting, can you help me? 
 agent: Ok, please hold on a moment. 
 customer: Ok, please check with my previous booking and tell me the status. 
 agent: Thanks for your time, there is no reservation found on your name. 
 customer: Oh! That's sad, thank you for checking anyways. 
 agent: Thanks for choosing us. 
 customer: You are most welcome.
A:
no_reservation