Definition: 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: Hello, I am Carolyn Lopez. 
 agent: Hello,. May I assist you ? 
 customer: I want to book a ticket from Orlando, FL-MCO on 10/08 to Oakland, CA-OAK on 10/10. 
 agent: Please wait for a while. 
 customer: Ok. 
 agent: Can I know price limit ? 
 customer: Sure, my price limit is 200 with single connection. 
 agent: Sorry, no flights available. 
 customer: Thanks for the information. 
 agent: Thanks.
Output:
no_flight