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 guide you? 
 customer: Gregory Mitchell here. I want to book a flight ticket from HOU to LAX. Can you help me in that? 
 agent: Sure. Can I know your travelling dates? 
 customer: My trip dates are Jan 11 to 13. 
 agent: Please let me know your connection limit. 
 customer: I need a flight with single connection. 
 agent:  Do you have any specific depart and arrival time for this trip? 
 customer: My depart time should be in the afternoon. 
 agent: Sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions. 
 customer: Ok, no issue. Thank you. 
 agent: Thank you for contacting us.
A:
no_flight