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 John Rodriguez. 
 agent: Hello, How can I assist you today? 
 customer: I want to book a flight ticket within 200. Can you help me? 
 agent: Sure, we are perky to help you. 
 customer: Thank you. 
 agent: Can you please provide your take off and landing airport codes? 
 customer: OAK and DFW are my airport codes. 
 agent: Do you prefer any halt in between your journey? On which dates would you like me to book a flight ticket for you? 
 customer: I need a connecting flight. 01/03 and 01/05 are my travelling dates. 
 agent: Ok, please wait a moment, let me search a flight for you. 
 customer: Ok. 
 agent: Sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions. 
 customer: No issue. Thank you for the information. 
 agent: Thank you for choosing us.
no_flight