You will be given a definition of a task first, then some input of the task.
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: Hi. 
 agent: Hello. 
 customer: I am Thomas Edwards. 
 agent: How can I assist you? 
 customer: Can you help me to cancel my reservation? 
 agent: Ok, I am here to help you. Can you please wait for a while. 
 customer: Sure, please check my reservation details. 
 agent: Sorry, no reservation found on your name to cancel. 
 customer: Oh! ok, no issues. Thank you for your time. 
 agent: Thank you for reaching us.
Output:
no_reservation