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,. 
 customer: I am Melissa Brown. 
 agent: Which service are you looking for? 
 customer: Due to an emergency meeting, I want to cancel my reservation. Can you help me with it? 
 agent: Sure, I will help you with that. 
 customer: OK. 
 agent: Please wait, Let me check your reservation status. 
 customer: OK. 
 agent: Thanks for waiting. Sorry Melissa Brown, No active reservation found on your name to cancel it. 
 customer: No problem, thank you for the information. 
 agent: Thanks for choosing us.
A:
no_reservation