Detailed 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
Problem:customer: Hi. 
 agent: Hello, how may I assist you? 
 customer: I am Gary Campbell. Please book a flight ticket from JFK to IAD. 
 agent: Sure, may I know your planned travel dates please? 
 customer: My travelling dates are 05/06 and 05/08. 
 agent: Sorry, there is no flight available on your requested dates. 
 customer: That's ok, thank you for the response. 
 agent: You are welcome.
Solution:
no_flight