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. 
 agent: Hello. What can I do for you today? 
 customer: I am planning to change my reservation, can you help me out with that? 
 agent: Sure, I am glad you help you with that. 
 customer: Thank you. 
 agent: Could you provide me your name? 
 customer: My name is Lisa Miller. 
 agent: Ok, wait for a minute. 
 customer: Ok. 
 agent: Sorry to say that, there is no active reservation found on your name in our database. 
 customer: NO issues, thank you for your time. 
 agent: Thank you for reaching us.
A:
no_reservation