Teacher: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
Teacher: Now, understand the problem? Solve this instance: customer: Hello. 
 agent: Hello. How can I help you today? 
 customer: I want the flight with 0 connection limit. Can you please help me out? 
 agent: Sure, I can check that for you. May I know your name to proceed further? 
 customer: Sure, my name is Samuel Baker. 
 agent: Could you please provide the airport codes? 
 customer: The airport codes are from IAD to OAK. 
 agent: Can you please share your preferable travel dates? 
 customer: The travel dates are from 05/23 to 05/25. Make sure that the price should not be more than 5000. 
 agent: Ok, please allow me a moment to check for the availability of flight. 
 customer: Sure, take your time. 
 agent: Your patience is greatly appreciated. Samuel, I am sorry to inform you that there is no flight available at your requested dates. 
 customer: Ok, no problem. I will check another flight to complete by trip. 
 agent: Thank you for contacting us. 
 customer: Thank you for your information. 
 agent: You are welcome.
Student:
no_flight