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: Can you aid me to book a ticket from MSP to AUS? 
 agent: Sure, can I have your travelling dates please? 
 customer: My trip dates are June 9 and June 11 respectively. 
 agent: Please provide your specifications. 
 customer: Make sure that connection limit is single. 
 agent: May I know your good name please? 
 customer: David Carter here. 
 agent: Unfortunately there is no flight found with your given details. 
 customer: Oh! ok. 
 agent: Thank you for reaching us. 
 customer: Thank you.
A:
no_flight