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? 
 customer: I am looking for a direct flight for my journey from PHX to HOU, can you please book my flight ticket? 
 agent: May I know your desired travel dates please? 
 customer: I want to depart on Jan 6th and I would like to return back on Jan 8th. 
 agent: There is a flight with connection limit 1 and fare 100, shall I proceed for booking? 
 customer: No, I prefer for a direct flight. 
 agent: May I know your name please? 
 customer: My name is Jacob Anderson. 
 agent: Sorry to say, there is no flight on your desired travel dates. 
 customer: No problem. Anyway, thank you for the information. 
 agent: Thank you for opting us.
A:
no_flight