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: Hi. 
 agent: Hello, how may I be at your service today? 
 customer: Could you please book a flight ticket from LAX to HOU? 
 agent: Sure, I will help you in booking the ticket. May I know your travelling dates please? 
 customer: My travelling dates are Feb 21 and Feb 23. 
 agent: Do you have any other specifications? 
 customer: I need a connecting flight, which returns in the evening. 
 agent: Please help me with your name for booking. 
 customer: I am Elizabeth Lopez. 
 agent: Sorry for this inconvenience, I could not find any flight with your requirements. 
 customer: Not a problem, thank you for the information. 
 agent: Thank you for reaching us.
Solution:
no_flight