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 assist you? 
 customer: My name is Stephen Hall. 
 agent: Nice to meet you Hall. 
 customer: I want to travel from BOS to DCA to attend my business meeting. Will you please help me in booking my ticket? 
 agent: Sure, I'm here to help you. Can you help me providing your journey dates please? 
 customer: My preferable dates are 11/08 to 11/10. Please make sure the connection is 0. 
 agent: Sorry to say this Hall, there are no flights with 0 connections. 
 customer: That's ok. Thank you for checking. 
 agent: Thank you for reaching us. Have a great day.
A:
no_flight