Detailed 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
Q: customer: Hello. 
 agent: Hello. How may I aid you today? 
 customer: My name is Robert Scott, please book me a plane ticket from BOS to OAK. 
 agent: Sure, I will help you with booking, please share your travelling dates? 
 customer: Sure, my travelling dates are from 10/23 to 10/25. 
 agent: There is a flight in UA airline with connection 1 as per your details, can I proceed to booking? 
 customer: I need 0 connected flight. 
 agent: Sorry, no flights as per your details. 
 customer: It's ok, thank you for the information. 
 agent: You are welcome. Thank you for reaching us.
A:
no_flight