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: I have to go New York for attending a summit there, can you please book a flight ticket from Las Vegas? 
 agent: Sure, help me with the travelling dates. 
 customer: My departure date is 02/20 and please book my return ticket also on 02/22. 
 agent: May I know your airport codes? 
 customer: I want to fly from LAS airport and destination airport is JFK. 
 agent: May I know your name? 
 customer: Sure, my name is Patrick Collins. 
 agent: Sorry, there is no flight on your requested dates. 
 customer: Oh! It's ok no problem, I will go with another airline. 
 agent: Thank you for reaching us. 
 customer: Thank you for your information.
A:
no_flight