Q: 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
customer: Hello. I am Richard Thomas. 
 agent: Hello, how can I support you today? 
 customer: Will you please cancel my existing reservation as my plan to meet my friend got cancelled? 
 agent: Sure, I am here to help you. 
 customer: Thank you. 
 agent: Please wait for a while, I will check your previous reservation. 
 customer: Sure. 
 agent: Thank you for your time, there is no reservation found on your name. 
 customer: It's ok, not an issue. Thank you for the information. 
 agent: Thank you for reaching us.
A:
no_reservation