Given the task definition and input, reply with output. 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 may I assist you today? 
 customer: Can you please book my flight ticket from EWR to MSP? 
 agent: Sure, I will help you. On which dates do you want to travel? 
 customer: My trip dates are 04/13 and 04/15. 
 agent: Could you please provide your name to book your flight ticket? 
 customer: Myself Dennis Brown. 
 agent: Ok, please hold on a moment to check the flights availability. 
 customer: Ok. 
 agent: Based on your information, flight number 1018 from Frontier airlines with 1 connection with the fare of 300 is available for you. Shall I proceed with this? 
 customer: Can you please search a flight ticket with price 200 or otherwise don't confirm this ticket. 
 agent: Sorry to inform you that, there are no flights available with in that budget. 
 customer: Ok, fine thank you for searching a flight ticket for me. 
 agent: Thank you for approaching us, have a great day.
no_flight