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, I am Anna Hill. 
 agent: Hello. How can I assist you Anna Hil? 
 customer: Help me to book a ticket for Los Angles CA-LAX, from there I will visit Hollywood. Can you help me to book a connecting flight? 
 agent: Sure, can you please provide your travelling dates? 
 customer: My trip dates are 11/08 and 11/10. 
 agent: May I know your origin airport code please? 
 customer: My origin is from Las Vegas, NV - LAS. 
 agent: Wait a moment please. 
 customer: Sure. 
 agent: There are no flights available on this route due to heavy bookings. 
 customer: Ok, no issues. 
 agent: Thank you for contacting us. 
 customer: Thanks for your kind service.
no_flight