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: Hello. 
 agent: Hello, how may I assist you today? 
 customer: Please book a flight ticket from HOU to EWR? 
 agent: Sure, can you please provide your journey dates? 
 customer: My journey dates are July 04 and July 06. 
 agent: Are you looking for any preferred connections? 
 customer: I need a connecting flight. 
 agent: Can I have you name to proceed further? 
 customer: I am Dorothy Walker. 
 agent: Do you have any other specifications to be met? 
 customer: No. 
 agent: Ok, please wait a moment. 
 customer: Sure. 
 agent: Thank you for your valuable time, unfortunately no flights available on that route. 
 customer: No problem, thank you for your information. 
 agent: Thank you for reaching us.
A:
no_flight