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. 
 agent: Hello. How may I help you? 
 customer: I want to go to LAX from LGA, so please help me to book a flight ticket. 
 agent: Sure, may I know your travelling dates? 
 customer: My travelling dates are 06/08 and 06/10. 
 agent: Ok, wait for a minute. May I know your name? 
 customer: My name is Linda Collins. 
 agent: Sorry, no flight's found on your details. 
 customer: Its ok, thank you for the information. 
 agent: Thank you for contacting us. 
 customer: You are welcome.
Output:
no_flight