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
Input: customer: Hello, Rebecca Thompson here. 
 agent: Hello. How can I help you? 
 customer: Can you book my flight ticket from DFW to SEA? 
 agent: May I know your travelling dates please? 
 customer: My travelling dates are from 02/26 to 02/28. Please make sure this, I want direct flight from my location to destination. 
 agent: I am Sorry, there are no flights with your connection limit. 
 customer: It's ok. Anyways, thank you to search. 
 agent: Thank you for approaching us.
Output:
no_flight