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 may I help you today? 
 customer: I am looking for a flight from DEN to IAD, can you help me in booking? 
 agent: Sure, can you share your travel dates please? 
 customer: Sure, my planned travel dates are Jan 04 and Jan 06. 
 agent: May I know your good name? 
 customer: Myself Dennis Carter. 
 agent: Please share your connection limit. 
 customer: Please look for a connecting flight as I need a break in between the journey. 
 agent: Is there any other specifications? 
 customer: No, thank you. 
 agent: Sorry, there is no flight service available on your required dates. 
 customer: That's ok, no problem. Thank you for the information. 
 agent: Thank you for choosing us.
Student:
no_flight