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: Hello. 
 agent: Hello. 
 customer: I am Dennis Jackson from Houston. 
 agent: Dennis Jackson, how can I assist you? 
 customer: I would like to attend a live music concert at New York with my friends. Can you please book a flight ticket for me? 
 agent: Sure, I am here to aid you. Please provide your itinerary dates. 
 customer: I want to depart on Nov 16 and return back on 18th Nov evening. 
 agent: May I know your genesis and terminus airport codes? 
 customer: My source and destination airport codes are HOU and LGA. 
 agent: Do you have any specifications? 
 customer: Yes, I am looking for a flight with 1 connection. 
 agent: Please give me a moment to check for available flights. 
 customer: Sure. 
 agent: Sorry, no flights are available as per your requirements. 
 customer: No problem, thank you for the information. 
 agent: Thank you for reaching us.
A:
no_flight