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: Helllo. 
 customer: I am Charles Carter. 
 agent: How can I assist you? 
 customer: I need to cancel my reservation, can you render me please? 
 agent: Ok, I will help you. Please wait. 
 customer: Thank you. 
 agent: Sorry, there is no name found in our reservation records. 
 customer: That's ok, no problem. Thank you for information. 
 agent: Thank you for connecting our agency.
A:
no_reservation