Q: 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. 
 agent: Hello, how may I help you? 
 customer: I would like to meet my friend on his birthday, please help me to book my flight ticket fro, EWR to IAD. 
 agent: Sure, can I know your travelling dates? 
 customer: Sure, I want to depart on Feb 12 and return back on Feb 14. 
 agent: On which name should I reserve the flight ticket? 
 customer: My name is John Clark. 
 agent: Do you have any connection limit? 
 customer: I prefer for a single connection. 
 agent: Do you have any other specifications? 
 customer: I have to depart in the morning and I prefer for an economy class. 
 agent: Sorry, there are no flights found on given dates. 
 customer: Sad to hear that, thank you for checking. 
 agent: Thank you for reaching us.
A:
no_flight