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: Hi. 
 agent: Hello, how can I assist you? 
 customer: I am Benjamin Thompson, can you find a flight for me? I am planning for a trip from LAG to LAX. 
 agent: Ok, may I know your travelling details? 
 customer: My travelling dates are 08/29 and 08/31. Did you find any flight for me? 
 agent: Sorry, there is no flight available for you. 
 customer: That is fine. 
 agent: Thank you for reaching us. 
 customer: Thank you for your help.
Output:
no_flight