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 Lisa Young. 
 agent: Hello, how can I assist you? 
 customer: I want to visit Lake Harriet at MSP, can you please book a ticket for me? 
 agent: Sure. Can you please provide the travelling dates? 
 customer: I intend to travel on 08/12 to 08/14. 
 agent: Do you have any limitations? 
 customer: Price 5000. I need 1 connection. 
 agent: Please share your airport codes. 
 customer: Origin: DFW. 
 agent: Thanks for the information. We did not found any flights matching your criterion. 
 customer: Ok. Thank you. 
 agent: Thanks for choosing us.
Student:
no_flight