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: I am Susan Hill here. 
 agent: Susan, how may I render you? 
 customer: I would like to book a flight ticket from LGA to DEN. Can you please help me with booking? 
 agent: Sure, please share your itinerary dates. 
 customer: My respective travelling dates are from 10/27 to 10/29. 
 agent: Please wait for a while. 
 customer: Sure, I will wait. 
 agent: Sorry, no flight is available on your route. 
 customer: Not a big problem, anyway, thank you for the information. 
 agent: Thank you for contacting us, have a good day. 
 customer: Thank you for searching.
Output:
no_flight