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. How can I assist you? 
 customer: I am here to ask a help from you, can you help me to book a flight ticket from LAS to LGA? 
 agent: Sure, I'll help you in that. May I know your preferable dates of journey? 
 customer: Ok, my travel dates are 09/22 and 09/24 respectively. 
 agent: Ok, please be on hold. 
 customer: Ok. 
 agent: There is a direct flight available, is that ok for you? 
 customer: No, please book a flight with 1 connection limit. 
 agent: Sorry to inform you that there are no flights available for you on those dates with 1 connection. 
 customer: Ok, not a problem. Thank you for the information. 
 agent: Can I have your good name for our documentation process?
A:
no_flight