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 oblige you today? 
 customer: I am going to enjoy my holiday trip in the Redwood Regional Park with my colleagues, which is at Oakland. Can you assist me in booking a flight with a single halt? 
 agent: Sure, we are blissful to help you. Kindly mention your price limit? 
 customer: I will spend only 200 for my journey. 
 agent: What are your planned trip dates? 
 customer: I intend to travel on 06/01, and I will recur on 06/03. 
 agent: Can you please provide your take off and landing airport codes? 
 customer: I want to Land at CA - OAK. My nearest boarding airport is from Charlotte, NC - CLT. 
 agent: May I know your name for documentation purpose? 
 customer: Sandra Young is my Name. 
 agent: Ok, wait for a while I will check the availability of flights and revert you. 
 customer: Sure. 
 agent: Sorry for the inconvenience, we are unable to find a flight on your preferred dates. 
 customer: Ok, not a problem at all. Thank you for the instant help without delay. 
 agent: Thank you for choosing us, Have a pleasant day.
A:
no_flight