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. 
 agent: Hello, how can I guide you for today? 
 customer: Due to some problems my trip was cancelled so can you please cancel my flight ticket? 
 agent: I am here to help you about that. Can you please provide your name to check the reservation status with your name? 
 customer: Thank you for your response, my name is Dennis Lee. 
 agent: I regret to say this Dennis Lee, there is no active reservation with your name in our booking list to cancel the reservation. 
 customer: It's ok no problem. Thank you for your information. 
 agent: You are welcome, thank you for reaching us.
A:
no_reservation