Q: 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
customer: Hi. 
 agent: Hello. How can I help you? 
 customer: Amanda Perez here. Can you please hold me a flight ticket from LGA to DFW? 
 agent: Sure, may I know your class preference? 
 customer: I need a business class to travel. 
 agent: Let me know your planned travel dates please. 
 customer: My trip dates are 03/11 - 03/13. 
 agent: Do you have any connection limit? 
 customer: I prefer a single connection. 
 agent: Unfortunately there is no flight found with your provided information. 
 customer: No issues, thank you for your information. 
 agent: Thank you for opting us.
A:
no_flight