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: Hello. 
 agent: Hello, How can I best assist you now? 
 customer: I want to go to Seattle next week so can you please help me in flight ticket booking process from ORD to SEA? 
 agent: Sure, can you please mention your departure and arrival dates of your journey? 
 customer: Thank you for your response, I want to take off on Sept 02 and book my return ticket also on Sept 04. 
 agent: Ok, which type of class do you prefer for your journey? 
 customer: I want to travel in business class flight. 
 agent: Do you need any flag stop in between journey? 
 customer: I need 1 break in between my journey so please check with this details. 
 agent: Ok, May I know your good name please? 
 customer: Sure, my name is Jacob Brown. 
 agent: Thanks for sharing your details, we are unable to provide flight in between your journey routes due to heavy snowfall at destination airport. 
 customer: Oh! It's ok no problem. Thank you for your information. 
 agent: Thanks for reaching us, wish you a great day.
Output:
no_flight