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
Input: customer: Hi. 
 agent: Hello. 
 customer: Myself Steven Lewis. 
 agent: Lewis, how can I help you? 
 customer: Due to some business meeting I am going to cancel my recent reservation. Can you please help me with that? 
 agent: Sure, I will help you in cancelling your reservation. Please wait, let me check your reservation status first. 
 customer: Sure. 
 agent: Lewis, I did not find any reservation under your name in our database. 
 customer: Not an issue, anyhow thank you very much for you service. 
 agent: You are most welcome and thank you for choosing us.
Output:
no_reservation