Teacher: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
Teacher: Now, understand the problem? Solve this instance: customer: Hello, I am Frank Davis. 
 agent: Hello, how may I serve you today? 
 customer: Due to my health condition I need to cancel my reservation, can you please help me? 
 agent: Sure, I will check in the database and get back to you. 
 customer: Ok. 
 agent: Sorry, there is no recent reservation on your name to cancel. 
 customer: Ok, no issues. Thank you for your response. 
 agent: Thank you for choosing us.
Student:
no_reservation