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, what can I do for you today? 
 customer: Can you please help me in flight ticket booking process from OAK to SFO? 
 agent: Sure, please forward your trip dates. 
 customer: Thank you for your response, I want to take off on Aug 27 and book my return ticket also on Aug 29. 
 agent: Is there any class preference? 
 customer: No. 
 agent: Any other requirement to be met? 
 customer: I will prefer direct flight. 
 agent: Can you please share your name to proceed further? 
 customer: Sure, my name is Steven Davis. 
 agent: Sorry, no flights found as per your requirements. 
 customer: Oh! It's ok, no problem. Thank you for your information. 
 agent: Thank you for contacting us.
Solution:
no_flight