Teacher: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
Teacher: Now, understand the problem? Solve this instance: customer: Hello. 
 agent: Hello. How may I guide you today? 
 customer: Jack King here. 
 agent: Welcome to flight booking agency King. 
 customer: I want to travel from DFW to DEN for attending a seminar. Can you please help me for booking the ticket? 
 agent: Sure, I will help you. 
 customer: Ok. 
 agent: Can you please help me with your preferable dates of travelling? 
 customer: My departure date is 09/02 and return date is 09/04. 
 agent: Sure, take your time. Please wait a moment to check the flights availability. 
 customer: Ok, take your time. 
 agent: Sorry to inform you that, there are no flights available with your requested dates of travelling. 
 customer: Thank you for the information. 
 agent: Thank you for reaching us, have a great day.
Student:
no_flight