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, how can I help you? 
 customer: I need to book a ticket from MSP to DEN. Could you book a ticket? 
 agent: Sure, please share me your travelling dates? 
 customer: Travelling dates are from Apr, 17 to Apr, 19. 
 agent: Do you have any class preference? 
 customer: I am comfortable with any class preference. 
 agent: Is there any connection limit? 
 customer: I prefer connecting flight. 
 agent: May I know your name? 
 customer: My name is Charles Collins. 
 agent: Sorry, there were no flights with your given details. 
 customer: Thank you.
Output:
no_flight