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: Hi. 
 agent: Hello, do you need any help from us? 
 customer: Can you help me in booking from DEN to EWR, as there is a business meeting to attend? 
 agent: Sure, could you please share your departure and arrival day? 
 customer: My journey dates are Jul 7 to Jul 9. 
 agent: Ok, could I have your name please? 
 customer: I am Margaret Clark. 
 agent: Ok, do you need direct or connecting flight? 
 customer: I am looking for a stopover flight. 
 agent: Ok, please allow me a moment. 
 customer: Sure. 
 agent: Sorry, there is no flight on your requested travelling dates. 
 customer: No issue, thank you. 
 agent: You are welcome, have a great day.
A:
no_flight