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
Q: customer: Hi. 
 agent: Hello. How can I help you today? 
 customer: I am Paul Wilson. I am planning to travel from IAD to MSP, can you please help in that? 
 agent: Sure, can you please provide your travelling dates to proceed further? 
 customer: My date of travelling is on 06/04 to 06/06. 
 agent: Wait a moment please. 
 customer: sure, but I want to travel in direct flight. 
 agent: Paul Wilson, there are no direct flights available on this route. 
 customer: That's ok, thanks for helping me. 
 agent: Thank you for contacting us.
A:
no_flight