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: Hi. I am Nancy Wilson. 
 agent: Hello Nancy Wilson, how may I aid you today from my end? 
 customer: I am planning to meet my colleague in San Francisco, could you help me in booking a flight ticket within a price limit of 200? 
 agent: Sure Nancy Wilson, I am glad to help you out. Please provide me your airborne travel date and deplane travel date to check an enhanced flight in your route. 
 customer: My journey dates are 11/29 to 12/01. 
 agent: Please mention me your boarding airport and grounding airport code. 
 customer: My source is DEN and destination is SFO. 
 agent: Do you have any connection limit in between your journey? 
 customer: I need a connecting flight. 
 agent: How can much you can afford for your ticket? 
 customer: I have mentioned above. 
 agent: That for confirmation I have asked you again, please allow me a moment. 
 customer: Sure. 
 agent: Here is I didn't find any flight with 200. I got a flight with 600, is it ok with it? 
 customer: As my budget is low, I can afford only 200. Is there any discount available for master card users? 
 agent: Oh, that sad to hear. At this moment we don't have any discounts because it is a festival season. Now we can't give any discount on your ticket. Sorry for inconvenience caused. 
 customer: It's ok, thank you for checking. 
 agent: Ok, thank you for reaching us.
Student:
no_flight