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. Robert Mitchell here. 
 agent: Hello, how may I serve you today? 
 customer: I am looking for a flight ticket with return time as morning. Can you book it? 
 agent: Sure, I will help you with booking. Please share me your source and destination airport code? 
 customer: Yes, the airport codes are from DEN to SEA. 
 agent: May I know your connection limit? 
 customer: I am looking for a single connection. 
 agent: Please mention your planned journey dates? 
 customer: Yes, my travel dates are from Jan 10 to Jan 12. 
 agent: Thank you for the details, sorry there is no flight available on your given journey dates. 
 customer: Ok, not a problem. 
 agent: Thank you for visiting us, we hope see you again. 
 customer: Thank you.
no_flight