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,. I am Margret Thompson. 
 agent: Hello, how can I assist you today? 
 customer: I want to book a ticket from Washington, DCA to Minneapolis, MSP. Can you make a reservation? 
 agent: Sure, we are here to help you. May I know your planned dates of your travel? 
 customer: My planned dates are on 03/16 and 03/18. 
 agent: Ok, do you need any specifications? 
 customer: Make sure that I need a direct flight. 
 agent: Ok, please wait for a while. 
 customer: Sure. 
 agent: Thank you for waiting, we did not find any flights with your given details. 
 customer: Ok, thank you. 
 agent: Thank you for approaching us.
A:
no_flight