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 be of your service? 
 customer: As I need to attend a film festival at Minneapolis & St. Paul, I would like to travel from Boston. Can you help me book a connecting flight? 
 agent: Sure, can I know your name please? 
 customer: Helen Carter is my name. 
 agent: Please let me know your fare limit. 
 customer: It should not exceed 1000. 
 agent: Can I know your preferable travelling dates? 
 customer: I would like to travel on 03/21 and 03/23. 
 agent: Could you please let me know your exact airport attributes? 
 customer: I want to fly from my nearest airport, BOS to MSP. 
 agent: Just a moment I will check and let you know. 
 customer: Sure. 
 agent: Thanks for waiting, unfortunately there are no flights found with your requested details. 
 customer: It's ok, thank you for the information. 
 agent: Thanks for picking us.
A:
no_flight