Detailed 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
Q: customer: Hello. 
 agent: Hello, how can I aid you? 
 customer: I need a flight ticket booking from LAX to ORD to attend a seminar, can you please assist me with flight ticket booking? 
 agent: Sure, can you share your trip dates? 
 customer: Thank you and I am planning to travel on July 7th and I will arrive back on July 9th. 
 agent: Do you have any preferences? 
 customer: I need a business class flight with single stop over in my journey. 
 agent: May I know your name? 
 customer: I am Kathleen Perez. 
 agent: Sorry, there is no flight on your given dates. 
 customer: No problem with that one, I can prefer any other source to reach my destination. Thank you for your help. 
 agent: Thank you for opting us. 
 customer: Welcome.
A:
no_flight