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
Problem:customer: Hello. 
 agent: Hello, how may I help you? 
 customer: I am Timothy Turner, I need a flight with one connection to attend a party with my cousin. 
 agent: Sure, I will help you. May I know your journey dates? 
 customer: I will take flight on 03/27 and return on 03/29. Please find a flight under price of 1000. 
 agent: Please, share the airport codes of your journey plan. 
 customer: I will fly from CA-SFO to DC-IAD. 
 agent: Unfortunately, there is no flight found on your specified dates. 
 customer: ok, thanks for the information. 
 agent: Sorry, for the inconvenience. Thanks for opting us.
Solution:
no_flight