Instructions: 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
Input: customer: Hello. 
 agent: Hello, how may I support you today? 
 customer: I am planning to attend a Seminar at Denver,can you help me with booking? 
 agent: Sure, I will help you with booking. Please share me source and destination airport codes? 
 customer: My airport codes are  IAD to DEN. 
 agent: Please mention when you planned to travel? 
 customer: My travel dates are June 24 and June 26. 
 agent: Do you want a connecting flight for your journey? 
 customer: Yes, I need a connecting flight. 
 agent: Is there any other preferences related to booking? 
 customer: No. 
 agent: May I know your good name? 
 customer: I am Helen Green. 
 agent: Thank you for the details, sorry there is no flight available on your given journey data. 
 customer: Ok, no problem. Thank you for your response. 
 agent: Thank you visiting us, we hope see you again.
Output:
no_flight