Detailed Instructions: 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 may I serve you today? 
 customer: I am Richard Miller, planning a holiday trip my self from PHX to DCA. 
 agent: Ok, can you please provide your travel dates? 
 customer: Please check flight availability on 08/25. I want a connecting flight. And I recur on 08/27. 
 agent: Ok, please wait I will check the availability of flights and revert you in a moment. 
 customer: I can afford with in a price of 500. 
 agent: Sorry, there were no flights found with your given details. 
 customer: Thank You for your information. 
 agent: Thank you for opting us, have a good day.
A:
no_flight