You will be given a definition of a task first, then some input of the task.
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

customer: Hello. 
 agent: Hello. 
 customer: Jessica Scott here. 
 agent: How may I assist you? 
 customer: Can you please help me in booking a flight ticket from HOU to MCO? 
 agent: Sure, can I have your planned travel dates please? 
 customer: Sure, my trip dates are from 02/22 to 02/24. 
 agent: Please hold on a moment. 
 customer: Sure. 
 agent: Scott, no flights has been found on your planned travel dates. 
 customer: Ok, no problem. Thank you for the information. 
 agent: Thank you for choosing us.
Output:
no_flight