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: Hi. 
 agent: Hello. 
 customer: I want to visit Space center in Houston,can you book a ticket for me? 
 agent: How can I assist you today? Sure, I will help you with flight ticket booking. May I know your good name for proceeding further? 
 customer: Myself Donald Hernandez. 
 agent: Ok, please let me know your travelling dates. 
 customer: My trip dates are 09/23 and 09/25. 
 agent: Can you please provide me basic details like airport codes of your locations? 
 customer: I want to fly from ATL to HOU. 
 agent: Ok, please wait a minute, I will inform you flight details. 
 customer: Ok. 
 agent: Thank you for your patience. Sorry to inform you, no airlines is providing a flight in your route. 
 customer: No problem. Thank you for checking. 
 agent: My pleasure. Thank you for choosing us. Have a good day.
Output:
no_flight